Synergistic Enhancement of Efficient Perovskite/Quantum Dot Tandem Solar Cells Based on Transparent Electrode and Band Alignment Engineering

Author:

Li Mingyu1,Yan Jun1,Zhao Xinzhao1,Ma Tianjun1,Zhang Afei1,Chen Shiwu1,Shen Guohuan1,Khalaf Gomaa Mohamed Gomaa1,Zhang Jianbing2,Chen Chao2,Hsu Hsien‐Yi3,Song Haisheng124ORCID,Yang Peizhi5,Tang Jiang12

Affiliation:

1. Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan Hubei 430074 P. R. China

2. School of Optical and Electronic Information Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan Hubei 430074 P. R. China

3. School of Energy and Environment & Department of Materials Science and Engineering City University of Hong Kong Kowloon Tong Hong Kong 999077 China

4. Wenzhou Advanced Manufacturing Technology Research Institute of Huazhong University of Science and Technology Wenzhou Zhejiang 325035 P. R. China

5. Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials Ministry of Education Yunnan Normal University Kunming 650500 P. R. China

Abstract

AbstractPerovskite‐based tandem solar cells have demonstrated high potential for overcoming the Shockley–Queisser limit. Routine bandgap (RBG, ≈1.55 eV) perovskites have achieved a perfect balance between efficiency and stability. The narrow bandgap (NBG) candidates for RBG perovskite‐based tandem devices are very limited. Lead sulfide (PbS) colloidal quantum dots (CQDs) are a promising partner due to their broad absorption spectra. However, the efficiency of RBG perovskite/QD tandem devices still lags behind. Herein, efficient RBG perovskite/QDs four‐terminal tandem photovoltaics are successfully implemented through synergistic enhancement from transparent electrode and band alignment Engineering. For tin doped indium oxide (ITO) electrodes, their conductivity and near‐infrared transparency are leveraged using magnetron sputtering and reactive plasma deposition (RPD) methods. Furthermore, instead of traditional zinc oxide, aluminum‐doped zinc oxide (AZO) is developed to enhance the carrier extraction capability of PbS QD bottom cells. Based on the above enhancements, ≈0.95 eV PbS solar cells achieve a record efficiency of 14.14%. Integrated with the front semi‐transparent perovskite solar cells, the four‐terminal perovskite/QD tandem device reaches a record efficiency of 26.12%. The synergistic combination of the RBG perovskite and NBG QD devices provides promising prospects for tandem photovoltaics.

Funder

National Natural Science Foundation of China

Innovation and Technology Commission

City University of Hong Kong

Publisher

Wiley

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