journal article·2021-06-11

Effect of Side-Group-Regulated Dipolar Passivating Molecules on CsPbBr3 Perovskite Solar Cells

Jialong Duan, Meng Wang, Yingli Wang, Junshuai Zhang, Qiyao Guo, Qiaoyu Zhang, Yanyan Duan, Qunwei Tang

ACS Energy Letters· Volume 6· Issue 6
Publisher page

Abstract

Interfacial passivation of defective perovskite films with a dipole molecule shows a great potential for high-efficiency perovskite solar cells (PSCs). Herein, by regulating the side group of an aniline-based molecule with an electron-withdrawing nitryl (−NO2) or electron-donating methoxyl (−OCH3), the binding energy between −NH2 and under-coordinated Pb2+ in the CsPbBr3 lattice is reinforced, and the dipole-moment-induced surface energy level reconstruction allows for efficient hole extraction for the −OCH3-tailored molecule because of the changed intramolecular electron distribution, whereas −NO2 displays the opposite effect. Finally, the all-inorganic CsPbBr3 PSC achieves a power conversion efficiency (PCE) of 9.81% with an open-circuit voltage (Voc) of 1.632 V and an excellent stability in both high humidity and light irradiation. Upon doping Sm3+ into CsPbBr3, the PCE and Voc are further increased to 10.75% and 1.675 V. This work confirms the importance of a side group on an interface dipole molecule to maximize the charge scavenging, especially for Voc improvement.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Information Science and Technology, Jinan University, Guangzhou 510632, P.R. China

Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, P.R. China

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China

State Centre for International Cooperation on Designer Low-Carbon and Environmental Material (SCICDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P.R. China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Fundamental Research Funds for the Central Universities · Guangdong Basic and Applied Basic Research Foundation · Guangzhou Basic and Applied Basic Research Foundation

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