Interfacial Engineering for High Efficiency Nanorod Array Structured Perovskite Solar Cells

Cao, Bingbing; Liu, Haoran; Yang, Longkai; Li, Xin; Liu, Hu; Dong, Pei; Mai, Xianmin; Hou, Chuanxin; Wang, Ning; Zhang, Jiaoxia; Fan, Jincheng; Gao, Qiang; Guo, Zhanhu

doi:10.1021/acsami.9b07610

Title: Interfacial Engineering for High Efficiency Nanorod Array Structured Perovskite Solar Cells

Journal Article · 31 July 2019 · ACS Applied Materials and Interfaces

DOI: https://doi.org/10.1021/acsami.9b07610 · OSTI ID:1546536

Cao, Bingbing ^[1]; Liu, Haoran ^[1]; Yang, Longkai ^[1]; Li, Xin ^[1]; Liu, Hu ^[2]; Dong, Pei ^[3]; Mai, Xianmin ^[4]; Hou, Chuanxin ^[5]; Wang, Ning ^[6]; Zhang, Jiaoxia ^[7]; Fan, Jincheng ^[8];

^[9]; Guo, Zhanhu ^[10]

Xiamen Univ., Xiiamen (China). Pen-Tung Sah Inst. of Micro-Nano Science and Technology
Zhengzhou Univ., Zhengzhou (China). Key Lab. of Materials Processing and Mold; Univ. of Tennessee, Knoxville, TN (United States). Integrated Composites Lab. (ICL), Dept. of Chemical & Biomolecular Engineering
George Mason Univ., Fairfax, VA (United States). Dept. of Mechanical Engineering
Southwest Minzu Univ., Chengdu (China). School of Urban Planning and Architecture
North Univ. of China, Taiyuan (China)
Hainan Univ., Haikou (China). State Key Lab. of Marine Resource Utilization in South China Sea
Univ. of Tennessee, Knoxville, TN (United States). Integrated Composites Lab. (ICL), Dept. of Chemical & Biomolecular Engineering; Jiangsu Univ. of Science and Technology, Zhenjiang (China)
Changsha Univ. of Science and Technology, Changsha (China). College of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Univ. of Tennessee, Knoxville, TN (United States). Integrated Composites Lab. (ICL), Dept. of Chemical & Biomolecular Engineering

TiO₂ nanorod (NR) array for perovskite solar cells (PSCs) has attached great importance due to superb power conversion efficiency (PCE) compared to traditional mesoporous TiO₂ film. A TiO₂ compact layer for the growth of TiO₂ NR array via spin-coating cannot meet the requirements for efficient NR based PSCs. Herein we have developed and demonstrated inserting an bifunctional extra-thin TiO₂ interlayer (5 nm) by atomic layer deposition (ALD) at the interface of FTO/TiO₂ compact layer to achieve an alleviated electron exchange and a reduced energetic barrier. Thus, an accelerated extraction of electrons from TiO₂ NR arrays via the compact layer to FTO substrate is ready for improving the PSC efficiency. The thickness of the spin-coated TiO₂ compact layer on the ALD-deposited TiO₂ layer is spontaneously optimized. Finally, an outstanding efficiency of 20.28% has been achieved from a champion PSC with negligible hysteresis and high reliability. To the best of our knowledge, this is the first time to demonstrate the superiority of TiO₂-NR based PSCs withstanding in dry heat and thermal cycling tests. The results are of great importance for the preparation of efficient and durable PSCs for our real-world applications.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1546536

Journal Information:: ACS Applied Materials and Interfaces, Vol. 11, Issue 37; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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