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Vol. 15 (2023)

Hole-Transport Management Enables 23%-Efficient and Stable Inverted Perovskite Solar Cells with 84% Fill Factor

https://doi.org/10.1007/s40820-023-01088-4
Liming Liu
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Yajie Ma
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Yousheng Wang
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Qiaoyan Ma
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Zixuan Wang
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Zigan Yang
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Meixiu Wan
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China
Tahmineh Mahmoudi
School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Jeonbuk National University, 567 Baekjedaero, Deokjin‑gu, Jeonju‑si, Jeollabuk‑do 54896, Republic of Korea
Yoon‑Bong Hahn
School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Jeonbuk National University, 567 Baekjedaero, Deokjin‑gu, Jeonju‑si, Jeollabuk‑do 54896, Republic of Korea
Yaohua Mai
Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, People’s Republic of China

Corresponding Author: Yaohua Mai

yaohuamai@jnu.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 117

Abstract

NiOx-based inverted perovskite solar cells (PSCs) have presented great potential toward low-cost, highly efficient and stable next-generation photovoltaics. However, the presence of energy-level mismatch and contact-interface defects between hole-selective contacts (HSCs) and perovskite-active layer (PAL) still limits device efficiency improvement. Here, we report a graded configuration based on both interface-cascaded structures and p-type molecule-doped composites with two-/three-dimensional formamidinium-based triple-halide perovskites. We find that the interface defects-induced non-radiative recombination presented at HSCs/PAL interfaces is remarkably suppressed because of efficient hole extraction and transport. Moreover, a strong chemical interaction, halogen bonding and coordination bonding are found in the molecule-doped perovskite composites, which significantly suppress the formation of halide vacancy and parasitic metallic lead. As a result, NiOx-based inverted PSCs present a power-conversion-efficiency over 23% with a high fill factor of 0.84 and open-circuit voltage of 1.162 V, which are comparable to the best reported around 1.56-electron volt bandgap perovskites. Furthermore, devices with encapsulation present high operational stability over 1,200 h during T90 lifetime measurement (the time as a function of PCE decreases to 90% of its initial value) under 1-sun illumination in ambient-air conditions.


Highlights:


1 A graded inverted solar cell configuration is developed by hole-transport management aiming to suppress interface defects-induced non-radiative recombination for efficient hole transport.
2 NiOx-based inverted PSCs present a power-conversion-efficiency over 23% with a high fill factor of 0.84 and open-circuit voltage of 1.162 volts, one of the best performances reported so far for 1.56-electron volt bandgap formamidinium-based triple-halide perovskites.
3 Devices show high operational stability over 1,200 h during T90 lifetime measurement under 1-sun illumination in ambient-air conditions.

Keywords

Inverted NiOx-based perovskite solar cells Hole-transport management Interface-induced defect passivation High performance and stability
Liu, Liming, Yajie Ma, Yousheng Wang, Qiaoyan Ma, Zixuan Wang, Zigan Yang, Meixiu Wan, Tahmineh Mahmoudi, Yoon‑Bong Hahn, and Yaohua Mai. 2023. “Hole-Transport Management Enables 23%-Efficient and Stable Inverted Perovskite Solar Cells With 84% Fill Factor”. Nano-Micro Letters 15 (April):117. https://doi.org/10.1007/s40820-023-01088-4.
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