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Nano Research

Article Title

Work function engineering to enhance open-circuit voltage in planar perovskite solar cells by g-C3N4 nanosheets

Authors

Jian Yang, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing 211167, China
Liang Chu, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaFollow
Ruiyuan Hu, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Wei Liu, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Nanjing Liu, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Yuhui Ma, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Waqar Ahmad, Department of Physics, Government College Women University, Kutchery Road, Sialkot 51310, Pakistan
Xing’ao Li, Institute of Advanced Materials & New Energy Technology Engineering Laboratory of Jiangsu Province & School of Materials Science and Engineering & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaFollow

Keywords

perovskite solar cells, power conversion efficiency, open-circuit voltage, g-C3N4 nanosheets, work function engineering

Abstract

Enhancement of open-circuit voltage (Voc) is an effective way to improve power conversion efficiency (PCE) of the perovskite solar cells (PSCs). Theoretically, work function engineering of TiO2 electron transport layer can reduce both the loss of Voc and current hysteresis in PSCs. In this work, two-dimensional g-C3N4 nanosheets were adopted to modify the compact TiO2 layers in planar PSCs, which can finely tune the work function (WF) and further improve the energy level alignment at the interface to enhance the Voc and diminish the hysteresis. Meanwhile, the quality of perovskite films and charge transfer of the devices were improved by g-C3N4 nanosheets. Therefore, the PCE of the planar PSCs was champed to 19.55% without obvious hysteresis compared with the initial 15.81%, mainly owing to the remarkable improvement of VOC from 1.01 to 1.11 V. In addition, the stability of the devices was obviously improved. The results demonstrate an effective strategy of WF engineering to enhance Voc and diminish hysteresis phenomenon for improving the performance of PSCs.

Publisher

Tsinghua University Press

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