High-Voltage-Efficiency Inorganic Perovskite Solar Cells in a Wide Solution-Processing Window

Linxing Zhang; Bo Li; Jifeng Yuan; Mengru Wang; Ting Shen; Fei Huang; Wen Wen; Guozhong Cao; Jianjun Tian

doi:10.1021/acs.jpclett.8b01553

High-Voltage-Efficiency Inorganic Perovskite Solar Cells in a Wide Solution-Processing Window

J Phys Chem Lett. 2018 Jul 5;9(13):3646-3653. doi: 10.1021/acs.jpclett.8b01553. Epub 2018 Jun 20.

Authors

Linxing Zhang¹, Bo Li¹, Jifeng Yuan¹, Mengru Wang¹, Ting Shen¹, Fei Huang¹, Wen Wen¹, Guozhong Cao^{1

2}, Jianjun Tian¹

Affiliations

¹ Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China.
² Department of Materials and Engineering , University of Washington , Seattle , Washington 98195-2120 , United States.

PMID: 29916713
DOI: 10.1021/acs.jpclett.8b01553

Abstract

Inorganic halide perovskites exhibit significant photovoltaic performance due to their structural stability and high open-circuit voltage ( V_oc). Herein, a general strategy of solution engineering has been implemented to enable a wide solution-processing window for high V_oc (∼1.3 V) and power conversion efficiency (PCE, ∼12.5%). We introduce a nontoxic solvent of dimethyl sulfoxide (DMSO) and an assisted heating process in the fabrication of CsPbI₂Br (CPI2) to control the improved crystallization. A wide solution-processing window including a wide range of solvent components and solute concentrations has been realized. The CPI2-based inorganic perovskite solar cells (IPSCs) exhibit a high PCE up to 12.52%. More importantly, these devices demonstrate a remarkable V_oc of 1.315 V. The performance has possessed such a region with high V_oc and PCE in all Cs-based IPSCs, unveiling wide solution-processing windows with enhanced solution processability facilitating potential industrial application especially for tandem solar cells.