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Multifunctional Polymer‐Regulated SnO 2 Nanocrystals Enhance Interface Contact for Efficient and Stable Planar Perovskite Solar Cells
Author(s) -
You Shuai,
Zeng Haipeng,
Ku Zhiliang,
Wang Xiaoze,
Wang Zhen,
Rong Yaoguang,
Zhao Yang,
Zheng Xin,
Luo Long,
Li Lin,
Zhang Shujing,
Li Min,
Gao Xingyu,
Li Xiong
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202003990
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , planar , optoelectronics , nanotechnology , nanocrystal , layer (electronics) , hysteresis , chemical engineering , computer graphics (images) , computer science , engineering , physics , quantum mechanics
Abstract Perovskite solar cells (PSCs) have rapidly developed and achieved power conversion efficiencies of over 20% with diverse technical routes. Particularly, planar‐structured PSCs can be fabricated with low‐temperature (≤150 °C) solution‐based processes, which is energy efficient and compatible with flexible substrates. Here, the efficiency and stability of planar PSCs are enhanced by improving the interface contact between the SnO 2 electron‐transport layer (ETL) and the perovskite layer. A biological polymer (heparin potassium, HP) is introduced to regulate the arrangement of SnO 2 nanocrystals, and induce vertically aligned crystal growth of perovskites on top. Correspondingly, SnO 2 –HP‐based devices can demonstrate an average efficiency of 23.03% on rigid substrates with enhanced open‐circuit voltage ( V OC ) of 1.162 V and high reproducibility. Attributed to the strengthened interface binding, the devices obtain high operational stability, retaining 97% of their initial performance (power conversion efficiency, PCE > 22%) after 1000 h operation at their maximum power point under 1 sun illumination. Besides, the HP‐modified SnO 2 ETL exhibits promising potential for application in flexible and large‐area devices.