Suppression of charge recombination by application of CueZnSnS4-graphene counter electrode to thin dye-sensitized solar cells  

作　　者：Yan Li Huafei Guo Xiuqin Wang Ningyi Yuan Jianning Ding 

机构地区：[1]Collaborative Innovation Center forPhotovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State KeyLaboratory of Photovoltaic Science and Technology, ChangzhouUniversity, Changzhou 213164, China [2]Micro/Nano Science and Technology Center, Jiangsu University,Zhenjiang 212013, China

出　　处：《Science Bulletin》2016年第15期1221-1230,共10页科学通报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （51272033, 51572037 and 51335002）, the Priority Academic Program Development of Jiangsu Higher Education Institutions and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China （14KJA430001）.

摘　　要：This paper proposes a new mechanism to explain the performance of thin dye-sensitized solar cells （DSSC）. Near-stoichiometric flower-like Cu2ZnSnS4 （CZTS） microspheres with a high specific surface area was fabri- cated for use as the photocathode in a DSSC. To improve the extraction and transfer of electrons, graphene was added to the CZTS. A DSSC with a 10-gin TiO2 pho- toanode layer exhibited a slightly degraded efficiency with a CZTS-graphene photocathode, relative to a Pt counter electrode （CE）. Nevertheless, when the thickness of the TiO2 photoanode was reduced to 2 lam, the efficiency of a DSSC with a CZTS-graphene photocathode was greater than that of a Pt-DSSC. It is speculated that, unlike the Pt CE, a CZTS-graphene photocathode not only collects electrons from an external circuit and catalyzes the reduction of the triiodide ions in the electrolyte, but also utilizes unabsorbed photons to produce photo-excited electrons and suppresses charge recombination, thus enhancing the performance of the cell. The use of narrowband gap p-type semiconductors as photocathodes offers a new means of fabricating thin dye-sensitized solar cells and effectively improving the cell performance.

关 键 词：Dye-sensitized solar cell Cu2ZnSnS4-graphene Charge recombination 

分 类 号：O484.1[理学—固体物理] TM914.4[理学—物理]