AUTHOR=Xue Juanjuan , Hu Xiaobo , Guo Yixin , Weng Guoen , Jiang Jinchun , Chen Shaoqiang , Zhu Ziqiang , Chu Junhao , Akiyama Hidefumi 

TITLE=Diagnosis of Perovskite Solar Cells Through Absolute Electroluminescence-Efficiency Measurements

JOURNAL=Frontiers in Physics

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00166

DOI=10.3389/fphy.2019.00166

ISSN=2296-424X

ABSTRACT=<p>Two organic-inorganic halide CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> perovskite solar cells prepared in the same experimental batch but having different power conversion efficiencies −18.46% and 17.15%—were investigated based on the absolute electroluminescence (EL) efficiency measurements and traditional I-V measurements. The possible factors that affect the power conversion efficiency were also investigated. Comparing the experimental I-V curves of the two solar cells, it was found that the short-circuit currents (<italic>J</italic><sub>sc</sub>) were nearly the same; however, the open-circuit voltages (<italic>V</italic><sub>oc</sub>) were markedly different. Moreover, the deduced I-V curves from the absolute EL efficiencies of the two solar cells, which were mainly affected by the material quality, were almost the same, proving that the device processing technology has a vital effect on <italic>V</italic><sub>oc.</sub></p>