DataVXACS Energy LettersPaper
journal article·2019-11-08

Perovskite Quantum Dot Solar Cells with 15.6% Efficiency and Improved Stability Enabled by an α-CsPbI3/FAPbI3 Bilayer Structure

Fangchao Li, Sijie Zhou, Jianyu Yuan, Chaochao Qin, Yingguo Yang, Junwei Shi, Xufeng Ling, Youyong Li, Wanli Ma

ACS Energy Letters· Volume 4· Issue 11
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Source abstract

Abstract

We developed lead halide perovskite quantum dot (QD) solar cells with a combinational absorbing layer based on stacked α-CsPbI3 and FAPbI3. α-CsPbI3 QDs, with a relatively wide bandgap of 1.75 eV, are not ideal for single-junction solar cells. We show that the absorption can be broadened by the introduction of another QD layer with a narrower bandgap like FAPbI3. The α-CsPbI3/FAPbI3 structure together with thermal annealing can improve the electrical coupling in the FAPbI3 layer and induce A-site cation exchange to develop a graded heterojunction for more efficient charge extraction. A highest power conversion efficiency of 15.6% and improved ambient stability have been achieved for the bilayer structured solar cells. More interestingly, the perovskite QDs provided a facile way to fabricate multiple layers and quantum junctions for optoelectronic applications via layer-by-layer deposition, which cannot be realized in solution-processed perovskite thin-film devices.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materialsMaterials processing

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

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

Affiliations

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, Jiangsu 215123, People’s Republic of China

College of Physics and Materials Science, Henan Normal University, Xinxiang, Henan 453007, People’s Republic of China

Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, People’s Republic of China

Funding

State Administration of Foreign Experts Affairs · Ministry of Science and Technology of the People's Republic of China · Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University

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