journal article·2020-10-09

Passivation Strategy of Reducing Both Electron and Hole Trap States for Achieving High-Efficiency PbS Quantum-Dot Solar Cells with Power Conversion Efficiency over 12%

Chao Ding, Feng Liu, Yaohong Zhang, Shuzi Hayase, Taizo Masuda, Ruixiang Wang, Yong Zhou, Yingfang Yao, Zhigang Zou, Qing Shen

ACS Energy Letters· Volume 5· Issue 10
Publisher page

Abstract

For the current passivation strategy, pure iodine passivation during solid-state ligand exchange (SSE) cannot completely passivate the entire surface of PbS colloidal quantum dots (CQDs). Here, a simple stepwise passivation strategy is proposed based on the postpassivation of PbS CQD films with a halogen (Cl, Br, or I) after iodine passivation through the SSE. This postpassivation could compensate for the missing ligands caused by the polar environment during the SSE. Thus, both electron- and hole-trapping states are greatly reduced, and the charge transport in the CQD film is significantly improved. The PbS CQD films post-treated with chlorine exhibit a carrier diffusion length increased by 70% when compared with that of control samples. We demonstrate the highest power conversion efficiency of 12.4% among the reported PbS CQD solar cells prepared with the SSE method to date. In addition, the unencapsulated device shows good stability in air.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Perovskite Materials and Applications

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

Affiliations

Faculty of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan

Info-Powered Energy System Research Center (i-PERC), The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan

S-Frontier Division, Toyota Motor Corporation, Susono, Shizuoka 410-1193, Japan

Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture, No. 15 Yongyuan Road, Huangcun, Daxing, Beijing 102616, China

Eco-Materials and Renewable Energy Research Center (ERERC), Jiangsu Key Laboratory for Nano Technology, Nanjing University, Nanjing 210093, China

Funding

Ministry of Education, Culture, Sports, Science and Technology · Ministry of Science and Technology of the People's Republic of China · Japan Science and Technology Agency · Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture

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