Low Temperature and Solution Processed WOx and SnO2 as Electron Selective Layer for Perovskite Solar Cells

Tingli Ma^a, Kai Wang^b, Yantao Shi^b

^aKyushu Insititute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyusyu, 808

^bDalian University of Technology, Dalian, 116024,, China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Tingli Ma, 090
Publication date: 5th February 2015

The performance of perovskite soalr cell(PSC) has greatly progressed in recent years through revolutionary improvements in the device structure. The electron selective layer (ESL) is an indispensable component of perovskite solar cells (PSCs) and is responsible for the collection of photogenerated electrons. Preparing ESL at a low temperature is significant for future fabrication of flexible PSCs. In this work, solution processed amorphous WO_x and SnO2 thin film was prepared facilely at low temperature and used as ESL in PSCs. Results indicated that a large quantity of nanocaves were observed in the WO_x thin film. In comparison with the conventional TiO₂ ESL, the WO_x ESL exhibited comparable light transmittance but higher electrical conductivity. Compared with the TiO₂-based PSCs, PSCs that uses WO_x and SnO2 ESL exhibited comparable photoelectric conversion efficiency, larger short circuit current density, but lower open-circuit voltage.Electrochemical characterization indicated that the unsatisfied open circuit voltage and fill factor were caused by the inherent charge recombination. This study demonstrated that these materials are the excellent candidates for ESL.
Figure 1. (a) Top view of the WOx ESL; (b) X-ray diffraction patterns of low-temperature processed WOx at 150C; (c) and (d) schematic structure and cross section SEM image of WOx-based PSCs, respectively.
Huawei Zhou, Yantao Shi, Qingshun Dong, Kai Wang, Yi Du, and Tingli Ma, Hole-Conductor-Free, Metal-Electrode-Free TiO2/CH3NH3PbI3 Heterojunction Solar Cells Based on a Low-Temperature Carbon Electrode J. Phys. Chem. Lett. 2014, DOI:10.1021/jz5017069

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