Adv. Mater.: High Efficiency Pb-In Binary Metal Perovskite Solar Cells

Title:

High Efficiency Pb-In Binary Metal Perovskite Solar Cells

Authors:

Zhao-Kui Wang,¹ Meng Li,¹Ying-Guo Yang,² Yun Hu,¹ Heng Ma,³ Xing-Yu Gao^*2and Liang-Sheng Liao^*1

Institutions:

¹Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China

²Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China

³College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, Henan 453007, China

Abstract:

Organometal halide perovskite solar cells bring a very competitive and fascinating prospect on solution-processable photovoltaic devices by their unimaginable efficiency racing. However, the fain utilization of lead in the materials will cause inevitable toxicology issue to the environment. Seeking new non-toxic materials to substitute lead is an important and urgent task. Here we propose and investigate an alternative organic-inorganic perovskite, CH₃NH₃Pb_1-aIn_aI₃Cl_a, where part of lead (II) is substituted by Indium (III). Grazing incidence X-ray diffraction reveals that the perovskite films exhibit multiple ordered crystal orientations, which lead to substantially improved power conversion efficiency of 17.55% in a planar heterojunction device compared with 12.61% in a pure-lead based control device. This work demonstrates the possibility to substitute lead (II) in organometal halide perovskites by Indium (III) besides Tin (II). The finding promotes the lead substitution to explore new alloy perovskite systems and paves one way to tune the crystallization kinetics of organometal halide perovskites for enhanced photovoltaic devices.

IF:

17.493

Link:

http://onlinelibrary.wiley.com/doi/10.1002/adma.201600626/full