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Vol. 12 (2020)

Hydroiodic Acid Additive Enhanced the Performance and Stability of PbS-QDs Solar Cells via Suppressing Hydroxyl Ligand

https://doi.org/10.1007/s40820-020-0372-z
Xiaokun Yang
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Ji Yang
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Jahangeer Khan
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Hui Deng
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Shengjie Yuan
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Jian Zhang
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Yong Xia
School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People’s Republic of China
Feng Deng
National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People’s Republic of China
Xue Zhou
National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People’s Republic of China
Farooq Umar
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Zhixin Jin
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Haisheng Song
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Chun Cheng
Department of Materials Science and Engineering and Shenzhen Key Laboratory of Nanoimprint Technology, South University of Science and Technology, Shenzhen 518055, People’s Republic of China
Mohamed Sabry
Physics Department, College of Applied Science, Umm Al-Qura University, Mecca, Kingdom of Saudi Arabia
Jiang Tang
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, People’s Republic of China

Corresponding Author: Chun Cheng

chengc@sustc.edu.cn

Nano-Micro Letters, Vol. 12 (2020), Article Number: 37

Abstract

The recent emerging progress of quantum dot ink (QD-ink) has overcome the complexity of multiple-step colloidal QD (CQD) film preparation and pronouncedly promoted the device performance. However, the detrimental hydroxyl (OH) ligands induced from synthesis procedure have not been completely removed. Here, a halide ligand additive strategy was devised to optimize QD-ink process. It simultaneously reduced sub-bandgap states and converted them into iodide-passivated surface, which increase carrier mobility of the QDs films and achieve thicker absorber with improved performances. The corresponding power conversion efficiency of this optimized device reached 10.78%. (The control device was 9.56%.) Therefore, this stratege can support as a candidate strategy to solve the QD original limitation caused by hydroxyl ligands, which is also compatible with other CQD-based optoelectronic devices.


Highlights:


1 The hydroiodic acid was explored systematically to modify PbS quantum dots (QDs) ink process, which could remove trap states by hydroxyl ligand and improve iodine passivation on the PbS-QDs surface.
2 This strategy solved the essential question of PbS-QDs ink process and showed the favorable application prospects in QDs technology.

Keywords

Hydroxyl ligand HI additive Surface passivation Quantum dots ink Solar cells
Yang, Xiaokun, Ji Yang, Jahangeer Khan, Hui Deng, Shengjie Yuan, Jian Zhang, Yong Xia, Feng Deng, Xue Zhou, Farooq Umar, Zhixin Jin, Haisheng Song, Chun Cheng, Mohamed Sabry, and Jiang Tang. 2020. “Hydroiodic Acid Additive Enhanced the Performance and Stability of PbS-QDs Solar Cells via Suppressing Hydroxyl Ligand”. Nano-Micro Letters 12 (January):37. https://doi.org/10.1007/s40820-020-0372-z.
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