journal article·2024-01-10

Reducing the Open-Circuit Voltage Loss of PbS Quantum Dot Solar Cells via Hybrid Ligand Exchange Treatment

Tengzuo Huang, Chunyan Wu, Jinpeng Yang, Pengyu Hu, Lei Qian, Tao Sun, Chaoyu Xiang

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Abstract

The interface V OC loss between the active layer and the hole transport layer (HTL) of lead sulfide colloidal quantum dot (PbS-CQD) solar cells is a significant factor influencing the efficiency improvement of PbS colloidal quantum dot solar cells (PbS-CQDSCs). Currently, the most advanced solar cells adopt organic P-type HTLs (PbS-EDT) via solid-state ligand exchange with 1,2-ethanedithiol (EDT) on the CQD top active layer. However, EDT is unable to altogether remove the initial ligand oleic acid from the quantum dot surface, and its high reactivity leads to cracks in the HTL film caused by volume contractions, which inevitably results in significant V OC loss. These flaws prompted this research to develop a method involving hybrid organic ligand exchange using 3-mercaptopropionic acid (MPA) and 1,2-EDT (PbS-Hybrid) to overcome these drawbacks of V OC loss. The results indicated that the new exchange strategy improved the quality of the HTL film and benefited from the enhanced passivation of the quantum dot surface and better alignment of energy levels, and the average V OC of PbS-Hybrid devices is increased by approximately 25 mV compared to control devices. With the enhanced V OC, the average power conversion efficiency (PCE) of the devices is improved by 10%, with the highest PCE reaching 13.24%.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Quantum Dots Synthesis And Properties · Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Qianwan Institute of CNITECH, Ningbo, Zhejiang 315336, P. R. China

International Joint Research Center of China for Optoelectronic and Energy Materials, Energy Research Institute, Yunnan University, Kunming, Yunnan 650091, P. R. China

Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo, Zhejiang 315201, P. R. China

Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, P. R. China

Funding

Science and Technology Innovation 2025 Major Project of Ningbo · National Key Research and Development Program of China · National Natural Science Foundation of China · 3315 Innovation Team in Ningbo City · Natural Science Foundation of Zhejiang Province · YONGJIANG Talent Introduction Programme · Flexible Electronics Zhejiang Province Key Laboratory fund project · Zhejiang Innovation and Entrepreneurship Team

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