Bottom-Up Quasi-Epitaxial Growth of Hybrid Perovskite from Solution Process-Achieving High-Efficiency Solar Cells via Template​-Guided Crystallization

Hengkai Zhang; Minchao Qin; Zhiliang Chen; Wei Yu; Zhiwei Ren; Kuan Liu; Jiaming Huang; Yaokang Zhang; Qiong Liang; Hrisheekesh Thachoth Chandran; Patrick W K Fong; Zijian Zheng; Xinhui Lu; Gang Li

doi:10.1002/adma.202100009

Bottom-Up Quasi-Epitaxial Growth of Hybrid Perovskite from Solution Process-Achieving High-Efficiency Solar Cells via Template-Guided Crystallization

Adv Mater. 2021 Jun;33(22):e2100009. doi: 10.1002/adma.202100009. Epub 2021 Apr 24.

Authors

Hengkai Zhang^{1

2}, Minchao Qin³, Zhiliang Chen¹, Wei Yu^{1

4}, Zhiwei Ren^{1

2}, Kuan Liu^{1

2}, Jiaming Huang^{1

2}, Yaokang Zhang⁵, Qiong Liang^{1

2}, Hrisheekesh Thachoth Chandran^{1

2}, Patrick W K Fong¹, Zijian Zheng⁵, Xinhui Lu³, Gang Li^{1

2}

Affiliations

¹ Department of Electronic and Information Engineering, Research Institute for Smart Energy (RISE), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
² Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China.
³ Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, China.
⁴ State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian, Liaoning, 116023, China.
⁵ Laboratory for Advanced Interfacial Materials and Devices, Research Centre for Smart Wearable Technology, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

PMID: 33893688
DOI: 10.1002/adma.202100009

Abstract

Epitaxial growth gives the highest-quality crystalline semiconductor thin films for optoelectronic devices. Here, a universal solution-processed bottom-up quasi-epitaxial growth of highly oriented α-formamidinium lead triiodide (α-FAPbI₃ ) perovskite film via a two-step method is reported, in which the crystal orientation of α-FAPbI₃ film is precisely controlled through the synergetic effect of methylammonium chloride and the large-organic cation butylammonium bromide. In situ GIWAXS visualizes the BA-related intermediate phase formation at the bottom of film, which serves as a guiding template for the bottom-up quasi-epitaxial growth in the subsequent annealing process. The template-guided epitaxially grown BAFAMA perovskite film exhibits increased crystallinity, preferred crystallographic orientation, and reduced defects. Moreover, the BAFAMA perovskite solar cells demonstrate decent stability, maintaining 95% of their initial power conversion efficiency after 2600 h ambient storage, and 4-time operation condition lifetime enhancement.

Keywords: bottom-up growth; perovskite solar cells; quasi-epitaxial growth; self-assembly.

Abstract

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