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Vol. 15 (2023)

In Situ Iodide Passivation Toward Efficient CsPbI3 Perovskite Quantum Dot Solar Cells

https://doi.org/10.1007/s40820-023-01134-1
Junwei Shi
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
Ben Cohen‑Kleinstein
Department of Electrical and Computer Engineering, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
Xuliang Zhang
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren‑Ai Road, Suzhou Industrial Park, Suzhou 215123, People’s Republic of China
Chenyu Zhao
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren‑Ai Road, Suzhou Industrial Park, Suzhou 215123, People’s Republic of China
Yong Zhang
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
Xufeng Ling
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren‑Ai Road, Suzhou Industrial Park, Suzhou 215123, People’s Republic of China
Junjun Guo
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren‑Ai Road, Suzhou Industrial Park, Suzhou 215123, People’s Republic of China
Doo‑Hyun Ko
Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
Baomin Xu
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
Jianyu Yuan
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren‑Ai Road, Suzhou Industrial Park, Suzhou 215123, People’s Republic of China
Wanli Ma
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren‑Ai Road, Suzhou Industrial Park, Suzhou 215123, People’s Republic of China

Corresponding Author: Jianyu Yuan

jyyuan@suda.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 163

Abstract

All-inorganic CsPbI3 quantum dots (QDs) have demonstrated promising potential in photovoltaic (PV) applications. However, these colloidal perovskites are vulnerable to the deterioration of surface trap states, leading to a degradation in efficiency and stability. To address these issues, a facile yet effective strategy of introducing hydroiodic acid (HI) into the synthesis procedure is established to achieve high-quality QDs and devices. Through an in-depth experimental analysis, the introduction of HI was found to convert PbI2 into highly coordinated [PbIm]2−m, enabling control of the nucleation numbers and growth kinetics. Combined optical and structural investigations illustrate that such a synthesis technique is beneficial for achieving enhanced crystallinity and a reduced density of crystallographic defects. Finally, the effect of HI is further reflected on the PV performance. The optimal device demonstrated a significantly improved power conversion efficiency of 15.72% along with enhanced storage stability. This technique illuminates a novel and simple methodology to regulate the formed species during synthesis, shedding light on further understanding solar cell performance, and aiding the design of future novel synthesis protocols for high-performance optoelectronic devices.


Highlights:


1 The introduction of hydroiodic acid (HI) manipulates the dynamic conversion of PbI2 into highly coordinated species to optimize the nucleation and growth kinetics.
2 The addition of HI enables the fabrication of CsPbI3 perovskite quantum dots with reduced defect density, enhanced crystallinity, higher phase purity, and near-unity photoluminescence quantum yield.
3 The efficiency of CsPbI3 perovskite quantum dot solar cells was enhanced from 14.07% to 15.72% together with enhanced storage stability.

Keywords

CsPbI3 perovskite quantum dots In situ passivation Surface trap states Perovskite solar cell
Shi, Junwei, Ben Cohen‑Kleinstein, Xuliang Zhang, Chenyu Zhao, Yong Zhang, Xufeng Ling, Junjun Guo, Doo‑Hyun Ko, Baomin Xu, Jianyu Yuan, and Wanli Ma. 2023. “In Situ Iodide Passivation Toward Efficient CsPbI3 Perovskite Quantum Dot Solar Cells”. Nano-Micro Letters 15 (June):163. https://doi.org/10.1007/s40820-023-01134-1.
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