High efficiency graphene solar cells by chemical doping pdf

Acid infiltration of nanotube networks significantly boost the cell efficiency by reducing the internal resistance that improves fill factor. Recently, several groups reported the b and n doping of graphene in the process of graphene synthesis. High efficiency graphene solar cells by chemical doping. Graphene is made of a single layer of carbon atoms that are bonded together in a repeating pattern of hexagons. This study paves a new venue for the development of grsi solar cells toward real applications. Sep 11, 2015 with a claimed power conversion efficiency of around 12 percent, the polyu solar cells outperform standard transparent and semitransparent versions handsdown. The basic principle of a graphene based solar cell is essentially not that different from current inorganicsilicon solar cells being produced today, with the exception that some of the materials currently in use are replaced with graphene derivatives. The main photovoltaic fom of the graphenebased bifacial perovskite solar cell are also shown. High performance single cds nanowire nanobelt schottky junction solar cells with au graphene schottky electrodes. We demonstrate single layer graphene nsi schottky junction solar cells that under am1.

Using this approach, the solar cell efficiency is improved from 17. Thanks to its high electrical conductivity and optical transparency, graphene has. Improved efficiency of graphenesi schottky junction solar cell. Both au nps decoration and hno3 treatment lead to ptype doping of graphene, and their combination is confirmed to be a more effective approach for achieving the higher work function and enhanced electrical. Enhanced electronic properties in mesoporous tio2 via lithium. Recently, graphenetcesbased schottkyjunction solar cells have been fabricated on various semiconducting. Graphenebased transparent electrodes for hybrid solar cells. The relationship between optical transparency, sheet resistance, and the number of layers can be characterized by a proportional decrease in both the optical transparency and the sheet resistance, with an increasing number of graphene layers. Request pdf ion doping of graphene for highefficiency heterojunction solar cells we demonstrated the ptype chemical doping by chlorine and nitrate anions to enhance the schottky junction in. Currentvoltage, capacitancevoltage and external quantum efficiency measurements show the enhancement to be due to the doping induced shift in the graphene chemical potential which increases the graphene carrier density decreasing the cell series resistance and increases the builtin potential.

The quality of the graphene itself is another crucial factor for achieving highperformance graphenebased oscs. Dopant gives graphene solar cells highest efficiency yet 21 may 2012, by lisa zyga graphenebased schottky junction solar cells. High efficiency graphene solar cells by chemical doping citeseerx. Solution preparation of molybdenum oxide on graphene.

Multifunctional graphene and carbon nanotube films for. High efficiency graphene solar cells by chemical doping nano. Nanoletthigh efficiency graphene solar cells by chemical dopingxiaochang miao. Highperformance single cds nanowire nanobelt schottky junction solar cells with augraphene schottky electrodes. Nitrate ions were found to be more effective for reducing the sheet resistance and enlarging the work function of graphene for effective charge separation and transport, and the efficiency was increased. However, the performance of the pscs based on sno2 is still hard to compete with the tio2based devices. Citeseerx document details isaac councill, lee giles, pradeep teregowda. A graphenesi schottky junction solar cell is commonly fabricated by using the topwindow structure. Layerbylayer hybrid chemical doping for high transmittance. A novel, comprehensive approach is required that incorporates high quality defectfree largearea graphene, improved graphene stacking, more efficient chemical doping, and. Large area graphene films were produced by chemical vapor deposition on copper foils and transferred onto glass as transparent electrodes.

Sem and tem characterizations of graphene films before a, c and after b, d chemical doping. Chemical doping is an effective way to improve the carrier concentration of gr, but it is not stable and the efficiency of solar cell suffers heavy degradation. Pdf high efficiency graphene solar cells by chemical doping. Heterojunction solar cells based on graphene woven fabrics and. As a new generation of thin film photovoltaic technology, organometallic halide perovskite solar cells pscs have been attracting considerable interest owing to their high efficiencies, minor environmental impact, and facile solution processability 14.

Graphenesi solar cells employing triethylenetetramine. Recently, graphenesi schottky solar cells based on a topgrid structure see fig. As it is not required for the polymer to have a strict energy level matching with the perovskite, in principle, one may use a variety of polymers for this type of. High efficiency graphene solar cells by chemical doping core. There are many posttreatments to enhance the efficiency of graphenensi solar cells, including chemical doping 6 of graphene by hno 3 fumigation 5, deposition of au nanoparticles 7,8. Stable high efficiency twodimensional perovskite solar cells via cesium doping xu zhang,abc xiaodong ren,b bin liu,b rahim munir,d xuejie zhu,b dong yang,b jianbo li,b yucheng liu,b 5 detlefm. Currentvoltage, capacitancevoltage, and external quantum efficiency measurements show the enhancement to be due to the dopinginduced shift in the graphene chemical potential that increases the graphene carrier density decreasing the cell series resistance and increases the cells builtin potential increasing the open circuit voltage both of which improve the solar cell fill factor. Notably, the power conversion efficiency pce of perovskitebased organicinorganic hybrid solar cells has improved from 3. University of florida physicists set new record for.

Jul 17, 2017 the number of graphene layers in the device or in the individual components within a device and the effects of doping a graphenebased material are the two prominent parameters that can potentially change the nature of the device for graphenebased solar cells. Highefficiency, semitransparent perovskitegraphene. Tin oxide sno2, as electron transport material to substitute titanium oxide tio2 in perovskite solar cells pscs, has aroused wide interests. The graphenebased transparent and conductive films were demonstrated to be costeffective electrodes working in organicinorganic hybrid schottky solar cells. We demonstrated the ptype chemical doping by chlorine and nitrate anions to enhance the schottky junction in the solar cell. Graphene solar cells are one of industrys great hopes for cheaper, durable solar power cells in the future. Graphene and carbonnanotubebased transparent electrodes. Introduction solar energy is a potential substitute for fossil fuels. Currentvoltage, capacitancevoltage, and external quantum efficiency measurements show the enhancement to be due to the doping induced shift in the graphene chemical potential that increases the graphene carrier density decreasing the cell series resistance and increases the cells builtin potential increasing the open circuit voltage. Smilgies,e ruipeng li,e zhou yang,b tianqi niu,b xiuli wang,a aram amassian,d kui zhaob and shengzhong frank liuab. Dopant gives graphene solar cells highest efficiency yet 21 may 2012, by lisa zyga graphene based schottky junction solar cells. But previous attempts to use graphene, a singleatomthick honeycomb lattice of carbon atoms, in solar cells have only managed power conversion efficiencies ranging up to 2. High efficiency schottky junction solar cells by codoping.

The graphene has been found to have higher mobility in comparison to other semiconductors and in a recent work, a diffusiondrift theory has been developed for understanding the carrier transport in single and multilayer graphene. Highefficiency, stable and nonchemically doped graphenesi. High efficiency graphene solar cells by chemical doping request. Doping may be a nono for athletes, but researchers say it was key in getting unprecedented power conversion efficiency from a new graphene solar cell created in their lab. The doping level of the graphene layer decreases with time due to evaporation and reduces the overall efficiency of the cell. Doping allowed the researchers to adjust graphenes fermi level a measure of electron potential energy, which resulted in two changes that improved the solar cells overall efficiency. High efficiency graphene solar cells by chemical doping yumpu. Thus, removing the pmma residue on graphene surfaces plays a vital role in the stability of chemical doped graphenesi schottky junction solar cells. Jan, 2016 enhanced electronic properties in mesoporous tio 2 via lithium doping for highefficiency perovskite solar cells. Request pdf high efficiency graphene solar cells by chemical doping we demonstrate single layer graphenensi schottky junction solar. Journal of materials chemistry a 2016, 4 27, 1055810565. While silicon has long been the standard for commercial solar cells, new research from the institute of photonic sciences icfo in spain has shown that graphene. Improved efficiency of graphenesi schottky junction solar. Multifunctional graphene and carbon nanotube films for planar.

As it is not required for the polymer to have a strict energy level matching with the perovskite, in principle, one may use a variety of polymers for this type of device design. Lastly, by doping both the ctio 2 and the mtio 2 with graphene flakes, the photovoltaic performances of the optimized graphenebased bifacial mesoscopic perovskite solar cell are further boosted to yield a pce of 12. Smilgies,e ruipeng li,e zhou yang,b tianqi niu,b xiuli wang,a aram amassian,d kui zhaob and shengzhong frank liuab adalianofnational laboratoryandfor clean. We demonstrate single layer graphenensi schottky junction solar cells that under am1.

Here, we demonstrate single layer graphenensi schottky junction solar cells that exhibit a native undoped power conversion efficiency under. In an effort to increase solar cell efficiency, scientists at michigan technological university are working on a cost effective method that adds graphene to titanium dioxide, increasing its conductivity and bringing 52. Enhanced electronic properties in mesoporous tio 2 via lithium doping for highefficiency perovskite solar cells. Four different graphene films were synthesized via chemical vapor deposition by using acetonitrile with feed rates of 0. A new graphene solar cell deploys common window glass to touch off a spontaneous doping effect, leading to high efficiency, low cost solar cells. Semitransparent solar cells sscs, which exhibit eyecatching appearances by creating neutral and multicolors, have recently gained significant interest for their potential use in a variety of applications, such as powergenerating windows for buildings and vehicles, highefficiency tandem solar cells, powergenerating color filters for displays, and wearable electronics 1. Since the birth of first prototype in 2009, the power conversion efficiency pce of pscs has undergone rapid. Improved efficiency of graphenesi heterojunction solar. Graphene, a material composed of oneatomthick planar sheets of sp 2 bonded carbon atoms with a twodimensional honeycomb structure, has been proposed for many applications due to its remarkable electronic, optical, thermal, and mechanical properties. High efficiency graphene solar cells by chemical doping by xiaochang miao, sefaattin tongay, maureen k. Various approaches to improve the efficiency of solar cells have followed the integration of nanomaterials into sibased photovoltaic devices. Herein, a novel strategy is designed to enhance the photovoltaic performance and longterm stability of pscs by integrating rareearth ions ln3. The solar cells based on graphene electrodes, especially those doped with hno 3, have comparable performance to the reference devices using commercial indium tin oxide ito. We dope semiconductorsthat is, introduce impurities into a pure crystalto modulate their.

However, in terms of the efficiency of pristine cells, the interfacial defect states and the increased thickness of the oxide layer in air a. Chemical doping and enhanced solar energy conversion of. Highefficiency, semitransparent perovskitegraphene solar. Mechanically stacked, twoterminal graphenebased perovskite. I assume youre asking about the actual physical doping process, as opposed to the particular doping schemes that are typically employed. Enhanced electronic properties in mesoporous tio2 via. This study paves a new venue for the development of grsi. The role of graphene and other 2d materials in solar photovoltaics.

The impact of graphene on the fabrication of thin film solar cells. Highperformance and hysteresisfree perovskite solar cells. Graphenesi solar cells employing triethylenetetramine dopant. Highperformance single cds nanowire nanobelt schottky. High efficiency graphene solar cell by chemical doping. Highperformance cspbi 2 br perovskite solar cells with. Its high transparency, conductivity, flexibility, and abundance make it an excellent material to be applied in the field of organic.

The number of graphene layers in the device or in the individual components within a device and the effects of doping a graphenebased material are the two prominent parameters that can potentially change the nature of the device for graphenebased solar cells. All the jv curves have been acquired in reverse voltage scan mode. May 24, 2012 doping may be a nono for athletes, but researchers say it was key in getting unprecedented power conversion efficiency from a new graphene solar cell created in their lab. Highperformance and hysteresisfree perovskite solar. Jan, 2016 enhanced electronic properties in mesoporous tio 2 via lithium doping for highefficiency perovskite solar cells fabrizio giordano, a, 1 antonio abate, 1 juan pablo correa baena, 2 michael saliba, 3 taisuke matsui, 4 sang hyuk im, 5 shaik m. Highefficiency, stable and nonchemically doped graphene. B jv characteristics measured for the optimized bifacial mesoscopic perovskite solar cells before and after doping the electron selective layer with graphene flakes. Heterojunction solar cells were assembled by transferring assynthesized graphene films onto nsi. If you use too much graphene, it will absorb the light in the solar cell and reduce its efficiency, he said.

We have reported an effective method to enhance the efficiency of grapheneonsi grsi schottky junction solar cells by co doping of graphene with au nanoparticles nps and hno3. Recently, based on the tremendous progresses in performance of perovskite solar cells pscs, the inverted planar pscs have attracted attentions for future applications. High efficiency graphene solar cells by chemical doping article in nano letters 126. Tianpeng jiao, jian liu, dapeng wei, yanhui feng, xuefen song, haofei shi, shuming jia, wentao sun, and chunlei du. Ancona, electron transport in graphene from a diffusiondrift perspective, ieee trans. May 21, 2012 dopant gives graphene solar cells highest efficiency yet. Hybrid organicinorganic perovskites have aroused great concerns because of their excellent electronic and optical properties 1,2,3,4,5,6,7 such as high mobility of the charge carriers and tunable band gap 8,9,10,11. Layerbylayer hybrid chemical doping for high transmittance uniformity in graphenepolymer flexible transparent conductive nanocomposite skip to main content thank you for visiting. However, in terms of the efficiency of pristine cells, the interfacial defect states and the increased thickness of the oxide layer in air also make highefficiency and. This performance, achieved by doping the graphene with bistrifluoromethanesulfonylamide, exceeds the native undoped device performance by a factor of. In graphenesi grsi solar cells, chemical doping could remarkably enhance the performance of the cells, but weakens their stability, which limits their further application. It is a 2 dimensional material with amazing characteristics, which grant it the title wonder material. The utilization of antireflection and additional chemical doping at the other side of the gr layer further improves the performance of the solar cells, which shows a power conversion efficiency of 12. Their work was presented at the usegypt joint workshop on solar energy systems, held march 1214 in cairo.

The hybrid solar cell devices consist of solutionprocessed poly 3,4ethlenedioxythiophene. It was funded by the american chemical society petroleum research fund and the national science foundation. Multilayer graphene as a transparent conducting electrode. However, in terms of the efficiency of pristine cells, the interfacial defect states and the increased thickness of the oxide layer in air also make highefficiency. Since the traditional poly3,4ethylenedioxythiophene hole transport layer could cause a loss of opencircuit voltage voc, some organic and inorganic alternatives have been widely investigated. Physicists set new record for graphene solar cell efficiency. Cesium doping stable high efficiency twodimensional. Improved efficiency of graphenesi heterojunction solar cells. Spontaneous solar cell powered by grapheneglass combo. Solar cells based on graphene samples produced at 0.

Zakeeruddin, 1 mohammad khaja nazeeruddin, 3 anders hagfeldt, 2 and michael graetzel b, 1. The attractive properties of graphene, such as nearzero bandgap, high electrical conductivity, high mobility, flexibility, and high. Colloidal antireflection coating improves graphenesilicon. The effect of socl2 doping time on the gsi solar cells was investigated. Pdf high efficiency graphene solar cells by chemical. In the last 50 years, silicon solar cells have dominated the market with record. The chemical doping is also employed to further improve the solar cell efficiency. Selfgeneration of a quasi pn junction for high efficiency chemical doping free graphenesilicon solar cells using a transition metal oxide interlayer. With a claimed power conversion efficiency of around 12 percent, the polyu solar cells outperform standard transparent and semitransparent versions hands. The uf team was able to achieve a record breaking 8. Improved interface control for highperformance graphene.

Enhanced electronic properties in mesoporous tio 2 via lithium doping for highefficiency perovskite solar cells fabrizio giordano, a, 1 antonio abate, 1 juan pablo correa baena, 2 michael saliba, 3 taisuke matsui, 4 sang hyuk im, 5 shaik m. However, reported devices have many drawbacks such as a small active area of 0. Enhanced electronic properties in mesoporous tio 2 via. Though the application of graphene in solar cells is only theoretical, the potential outlined in the study is remarkable. It is extremely strong and almost entirely transparent and also astonishingly conductive and flexible. Doping may be a nono for athletes, but researchers in the university of floridas physics department say it was key in getting unprecedented power conversion efficiency from a new graphene solar cell created in their lab. High efficiency schottky junction solar cells by codoping of. Graphene solar cells are one of industrys great hopes for cheaper, durable. Currentvoltage, capacitancevoltage, and external quantum efficiency measurements show the enhancement to be due to the dopinginduced shift in the graphene chemical potential that increases the graphene carrier density decreasing the cell series resistance and increases the cell s builtin potential increasing the open circuit voltage both of which improve the solar cell fill factor. Dopant gives graphene solar cells highest efficiency yet. Ion doping of graphene for highefficiency heterojunction.