Self-supported metal sulphide nanocrystals-assembled nanosheets on carbon paper as efficient counter electrodes for quantum-dotsensitized solar cells

查看全文 作　　者：Jian-Kun [1,3]Sun;Linlin [2]Zhang;Liang [2]Yue;Tang [1]Tang;Wen-Jie [1]Jiang;Yun [1]Zhang;Zhenxiao [2]Pan;Xinhua [2]Zhong;Jin-Song [1,3]Hu;Li-Jun [1,3]Wan 机构地区：[1]CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Research Center for Molecular Sciences, CAS Research/Education Center for Excellence in Molecule Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;[2]College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China;[3]University of Chinese Academy of Sciences, Beijing 100049, China 出　　处：《Science China Chemistry》索引2018年第61卷第10期,共7页 基　　金：supported by the National Natural Science Foundation of China (21573249, 51732004);the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB12020100) 摘　　要：Developing efficient counter electrodes(CEs)and quantum dots made of earth-abundant and non-toxic elements is essential but still challenging for quantum dot-sensitized solar cells(QDSSCs).Here,we report a facile strategy to prepare self-supported and robust CoS_2and NiS nanocrystals-assembled nanosheets directly grown on carbon paper(MS_xNS@CP)as efficient counter electrodes for QDSSCs.Such CEs integrate the merits of fast electron transfer from interconnected conductive scaffold,efficient mass transfer from hierarchically vertical nanosheet on 3D open substrate,as well as abundant highly active catalytic sites from metal sulphide nanocrystal units.As a result,QDDSCs based on such CoS_2NS@CP and NiS NS@CP CEs achieve a PCE of8.88%and 7.53%,respectively.The detailed analyses suggest that CoS_2NS@CP has the highest catalytic activity and shows the lowest charger transfer resistance,leading to the highest PCE.These findings may inspire the design and exploration of other self-supported efficient CEs by integrating highly active catalysts onto 3D conductive networks for efficient QDSSCs. 关 键 词：太阳能电池 复写纸 电极 装配 硫醚 金属 电子转移 挑战性