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Realization of Moisture-Resistive Perovskite Films for Highly Efficient Solar Cells Using Molecule Incorporation.

Authors
  • Azam, Muhammad1, 2, 3
  • Yue, Shizhong1, 2
  • Xu, Rui4
  • Yang, Shuaijian1, 2
  • Liu, Kong1, 2
  • Huang, Yanbin1, 2
  • Sun, Yang1, 2
  • Hassan, Ali5
  • Ren, Kuankuan1, 2
  • Tan, Furui6
  • Wang, Zhijie1, 2
  • Lei, Yong4
  • Qu, Shengchun1, 2
  • Wang, Zhanguo1, 2
  • 1 Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China. , (China)
  • 2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. , (China)
  • 3 Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China. , (China)
  • 4 Institut für Physik & IMN [email protected] (ZIK), Technische Universität Ilmenau, Ilmenau 98693, Germany. , (Germany)
  • 5 Key Laboratory of Optoelectronic Devices and Systems of Guangdong Province & Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. , (China)
  • 6 Key Laboratory of Photovoltaic Materials, Department of Physics and Electronics, Henan University, Henan 475004, China. , (China)
Type
Published Article
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society
Publication Date
Sep 02, 2020
Volume
12
Issue
35
Pages
39063–39073
Identifiers
DOI: 10.1021/acsami.0c09046
PMID: 32805927
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The development of highly crystalline perovskite films with large crystal grains and few surface defects is attractive to obtain high-performance perovskite solar cells (PSCs) with good device stability. Herein, we simultaneously improve the power conversion efficiency (PCE) and humid stability of the CH3NH3PbI3 (CH3NH3 = MA) device by incorporating small organic molecule IT-4F into the perovskite film and using a buffer layer of PFN-Br. The presence of IT-4F in the perovskite film can successfully improve crystallinity and enhance the grain size, leading to reduced trap states and longer lifetime of the charge carrier, and make the perovskite film hydrophobic. Meanwhile, as a buffer layer, PFN-Br can accelerate the separation of excitons and promote the transfer process of electrons from the active layer to the cathode. As a consequence, the PSCs exhibit a remarkably improved PCE of 20.55% with reduced device hysteresis. Moreover, the moisture-resistive film-based devices retain about 80% of their initial efficiency after 30 days of storage in relative humidity of 10-30% without encapsulation.

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