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Highly efficient GaAs solar cells by limiting light emission angle

作     者:Emily D Kosten Jackson H Atwater James Parsons Albert Polman Harry A Atwater 

作者机构:Thomas J.Watson Laboratories of Applied PhysicsCalifornia Institute of TechnologyPasadenaCA 91125 USA Center for NanophotonicsFOM-Institute AMOLFScience Park 1041098XG AmsterdamThe Netherlands 

出 版 物:《Light(Science & Applications)》 (光(科学与应用)(英文版))

年 卷 期:2013年第2卷第1期

页      面:236-241页

核心收录:

学科分类:080901[工学-物理电子学] 0809[工学-电子科学与技术(可授工学、理学学位)] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基  金:Thanks to D Callahan M Sheldon and J van de Groep for insightful discussions and advice on the manuscript.The authors also found advice from O Miller on handling non-radiative recombination R Briggs on mode structure calculations J Zipkin on numerical methods and C Eisler on internal fluorescence yield derivations extremely helpful.The authors are grateful for technical assistance from G Vollenbroek.The Caltech researchers are supported by the‘Light-Material Interactions in Energy Conversion’Energy Frontier Research Center funded by the US Department of Energy Office of Science Office of Basic Energy Sciences under grant DE-SC0001293(EK and HA).EK also acknowledges the support of the Resnick Sustainability Institute.Researchers of the Center for Nanophotonics at AMOLF are supported by the research program of FOM which is financially supported by NWO and by the European Research Council 

主  题:detailed balance GaAs solar cell light trapping photovoltaics two photon lithography 

摘      要:In a conventional flat plate solar cell under direct sunlight,light is received from the solar disk,but is re-emitted *** isotropic emission corresponds to a significant entropy increase in the solar cell,with a corresponding drop in ***,using a detailed balance model,we show that limiting the emission angle of a high-quality GaAs solar cell is a feasible route to achieving power conversion efficiencies above 38%with a single *** highest efficiencies are predicted for a thin,light trapping cell with an ideal back reflector,though the scheme is robust to a non-ideal back *** with a conventional planar cell geometry illustrates that limiting emission angle in a light trapping geometry not only allows for much thinner cells,but also for significantly higher overall efficiencies with an excellent rear ***,we present ray-tracing and detailed balance analysis of two angular coupler designs,show that significant efficiency improvements are possible with these couplers,and demonstrate initial fabrication of one coupler design.

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