Low-temperature Solution-Processed Indium Incorporated Zinc Oxide Electron Transport Layer for High-efficiency Lead Sulfide Colloidal Quantum Dot Solar Cells Rabia Bashir, a,b Muhammad Kashif Bilal, b Amna Bashir, c Jianhong Zhao, a Sana Ullah Asif, b Waqar Ahmad, d Jiyang Xie b and Wanbiao Hu a,b, * a Key Laboratory of LCR Materials and Devices of Yunnan Province, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China b School of Physics and Astronomy, Yunnan University, Kunming 650091, P. R. China. c Department of Chemistry, Quaid-e-Azam University, Islamabad 45320, Pakistan. d Department of Physics, Government College Women University, Sialkot 45320, Pakistan. Correspondence should be addressed to: Wanbiao Hu (huwanbiao@ynu.edu.cn) Electronic Supplementary Material (ESI) for Nanoscale. This journal is © The Royal Society of Chemistry 2021