Hybrid PbS Quantum-Dot-in-Perovskite for High-Efficiency Perovskite Solar Cell

Jianhua Han; Songping Luo; Xuewen Yin; Yu Zhou; Hui Nan; Jianbao Li; Xin Li; Dan Oron; Heping Shen; Hong Lin

doi:10.1002/smll.201801016

Hybrid PbS Quantum-Dot-in-Perovskite for High-Efficiency Perovskite Solar Cell

Small. 2018 Jul 4:e1801016. doi: 10.1002/smll.201801016. Online ahead of print.

Authors

Jianhua Han¹, Songping Luo¹, Xuewen Yin¹, Yu Zhou¹, Hui Nan¹, Jianbao Li^{1

2}, Xin Li³, Dan Oron⁴, Heping Shen⁵, Hong Lin¹

Affiliations

¹ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
² State Key Laboratory of Marine Resource Utilization in South China Sea, Materials and Chemical Engineering Institute, Hainan University, Haikou, 570228, China.
³ Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361000, China.
⁴ Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, 76100, Israel.
⁵ Centre for Sustainable Energy System, Research School of Engineering, Australian National University, Canberra, 2601, Australia.

PMID: 29971908
DOI: 10.1002/smll.201801016

Abstract

In this study, a facile and effective approach to synthesize high-quality perovskite-quantum dots (QDs) hybrid film is demonstrated, which dramatically improves the photovoltaic performance of a perovskite solar cell (PSC). Adding PbS QDs into CH₃ NH₃ PbI₃ (MAPbI₃ ) precursor to form a QD-in-perovskite structure is found to be beneficial for the crystallization of perovskite, revealed by enlarged grain size, reduced fragmentized grains, enhanced characteristic peak intensity, and large percentage of (220) plane in X-ray diffraction patterns. The hybrid film also shows higher carrier mobility, as evidenced by Hall Effect measurement. By taking all these advantages, the PSC based on MAPbI₃ -PbS hybrid film leads to an improvement in power conversion efficiency by 14% compared to that based on pure perovskite, primarily ascribed to higher current density and fill factor (FF). Ultimately, an efficiency reaching up to 18.6% and a FF of over ≈0.77 are achieved based on the PSC with hybrid film. Such a simple hybridizing technique opens up a promising method to improve the performance of PSCs, and has strong potential to be applied to prepare other hybrid composite materials.

Keywords: PbS; crystallization; hybridizing technique; perovskite solar cells; quantum dots.