Volume 15, Issue 47 1904372
Full Paper

Goethite Quantum Dots as Multifunctional Additives for Highly Efficient and Stable Perovskite Solar Cells

Hui Chen

Hui Chen

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228 P. R. China

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Qiang Luo

Qiang Luo

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228 P. R. China

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Tao Liu

Tao Liu

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228 P. R. China

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Jing Ren

Jing Ren

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

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Shuang Li

Shuang Li

School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025 P. R. China

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Meiqian Tai

Meiqian Tai

School of Material Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Hong Lin

Hong Lin

School of Material Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Hongcai He

Hongcai He

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

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Jinshu Wang

Jinshu Wang

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

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Ning Wang

Corresponding Author

Ning Wang

State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China

State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228 P. R. China

E-mail: [email protected]Search for more papers by this author
First published: 14 October 2019
Citations: 33

Abstract

Minimization of defects and ion migration in organic–inorganic lead halide perovskite films is desirable for obtaining photovoltaic devices with high power conversion efficiency (PCE) and long-term stability. However, achieving this target is still a challenge due to the lack of efficient multifunctional passivators. Herein, to address this issue, n-type goethite (FeOOH) quantum dots (QDs) are introduced into the perovskite light-absorption layer for achieving efficient and stable perovskite solar cells (PSCs). It is found that the iron, oxygen, and hydroxyl of FeOOH QDs can interact with iodine, lead, and methylamine, respectively. As a result, the crystallization kinetics process can be retarded, thereby resulting in high quality perovskite films with large grain size. Meanwhile, the trap states of perovskite can be effectively passivated via interaction with the under-coordinated metal (Pb) cations, halide (I) anions on the perovskite crystal surface. Consequently, the PSCs with FeOOH QDs achieve a high efficiency close to 20% with negligible hysteresis. Most strikingly, the long-term stability of PSCs is significantly enhanced. Furthermore, compared with the CH3NH3PbI3-based device, a higher PCE of 21.0% is achieved for the device assembled with a Cs0.05FA0.81MA0.14PbBr0.45I2.55 perovskite layer.

Conflict of Interest

The authors declare no conflict of interest.

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