Organo-metal halide perovskite-based solar cells with CuSCN as the inorganic hole selective contact

被引:167
作者
Chavhan, Sudam [1 ]
Miguel, Oscar [1 ]
Grande, Hans-Jurgen [1 ]
Gonzalez-Pedro, Victoria [2 ]
Sanchez, Rafael S. [2 ]
Barea, Eva M. [2 ]
Mora-Sero, Ivan [2 ]
Tena-Zaera, Ramon [1 ]
机构
[1] IK4 CIDETEC, Div Energy, Donostia San Sebastian 20009, Spain
[2] Univ Jaume 1, Dept Fis, Photovolta & Optoelect Devices Grp, Castellon de La Plana 12071, Spain
关键词
EFFICIENT; TEMPERATURE; TRANSPORT; RECOMBINATION; CONDUCTIVITY; PERFORMANCE; MECHANISM;
D O I
10.1039/c4ta01310g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
CuSCN is proposed as a cost-competitive hole selective contact for the emerging organo-metal halide perovskite-based solar cells. The CuSCN films have been deposited by a solution casting technique, which has proven to be compatible with the perovskite films, obtaining planar-like heterojunction-based glass/FTO/TiO2/CH(3)NH(3)Pbl(3-x)Cl(x)/CuSCN/Au solar cells with a power conversion efficiency of 6.4%. Among the photovoltaic parameters, the fill factor (i.e. 62%) suggests good carrier selectivity and, therefore, efficient functionality of the TiO2 and CuSCN charge carrier selective contacts. However, the open-circuit voltage (V-oc), which remains low in comparison with the state of the art perovskite-based solar cells, appears to be the main limiting parameter. This is attributed to the short diffusion length as determined by impedance spectroscopy. However, the recombination losses are not only affected by the CuSCN, but also by the perovskite film. Indeed, variations of 20 degrees C in the thermal annealing of the perovskite films result in changes larger than 200 mV in the V-oc. Furthermore, a detailed analysis of the quantum efficiency spectra contributes significant insights into the influence of the selective contacts on the photocurrent of the planar heterojunction perovskite solar cells.
引用
收藏
页码:12754 / 12760
页数:7
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