Semiconductor sensitized solar cells(SSSCs) are promising candidates for the third generation of cost-effective photovoltaic solar cells and it is important to develop a group of robust, environment-friendly and visible-light-responsive semiconductor sensitizers. In this paper, we first synthesized bismuth vanadate(Bi VO4) quantum dots by employing facile successive ionic layer adsorption and reaction(SILAR) deposition technique, which we then used as a sensitizer for solar energy conversion. The preliminary optimised oxide SSSC showed an efficiency of 0.36%, nearly 2 orders of magnitude enhancement compared with bare Ti O2, due to the narrow bandgap absorption of Bi VO4 quantum dots and intimate contact with the oxide substrate. This result not only demonstrates a simple method to prepare Bi VO4 quantum dots based solar cells, but also provides important insights into the low bandgap oxide SSSCs.
Yi LiJun ZhuHui ChuJunfeng WeiFeng LiuMei LvJunwang TangBing ZhangJianxi YaoZhipeng HuoLinhua HuSongyuan Dai
Cu2S film onto FTO glass substrate was obtained to function as counter electrode for polysulfide redox reactions in CdS/CdSe co-sensitized solar cells by sintering after spraying a metal chalcogenide complex, N4H9Cu7S4 solution. Relative to Pt counter electrode, the Cu2S counter electrode provides greater electrocatalytic activity and lower charge transfer resistance. The prepared Cu2S counter electrode represented nanoflower-like porous film which was composed of Cu2S nanosheets on FTO and had a higher surface area and lower sheet resistance than that of sulfided brass Cu2S counter electrode. An energy conversion efficiency of 3.62% was achieved using the metal chalcogenide complex-mediated fabricated Cu2S counter electrode for CdS/CdSe co-sensitized solar cells under 1 sun, AM 1.5 illumination.
纳米Ti O2多孔薄膜中陷阱态的数量与分布可影响光致电子的传输与复合,进而影响染料敏化太阳电池(DSSCs)的性能.本文采用三电极体系,基于电化学阻抗谱(EIS)及循环伏安法(CV),研究了分别由10,20,80和200 nm Ti O2纳米颗粒组成的多孔薄膜中陷阱态的分布情况,结果表明,多孔薄膜中陷阱态的含量随颗粒的增大而减少.同时,光电子能谱(XPS)表征结果显示,多孔薄膜中Ti3+及氧空位的含量随颗粒增大有所减少.本研究工作为不同尺寸纳米颗粒的多孔薄膜对电池光伏性能影响提供了又一微观机制说明.
