Enhancing the Durability and Carrier Selectivity of Perovskite Solar Cells Using a Blend Interlayer

ACS Applied Materials & Interfaces
Dong Hun SinKilwon Cho

Abstract

A mechanically and thermally stable and electron-selective ZnO/CH3NH3PbI3 interface is created via hybridization of a polar insulating polymer, poly(ethylene glycol) (PEG), into ZnO nanoparticles (NPs). PEG successfully passivates the oxygen defects on ZnO and prevents direct contact between CH3NH3PbI3 and defects on ZnO. A uniform CH3NH3PbI3 film is formed on a soft ZnO:PEG layer after dispersion of the residual stress from the volume expansion during CH3NH3PbI3 conversion. PEG also increases the work of adhesion of the CH3NH3PbI3 film on the ZnO:PEG layer and holds the CH3NH3PbI3 film with hydrogen bonding. Furthermore, PEG tailors the interfacial electronic structure of ZnO, reducing the electron affinity of ZnO. As a result, a selective electron-collection cathode is formed with a reduced electron affinity and a deep-lying valence band of ZnO, which significantly enhances the carrier lifetime (473 μs) and photovoltaic performance (15.5%). The mechanically and electrically durable ZnO:PEG/CH3NH3PbI3 interface maintains the sustainable performance of the solar cells over 1 year. A soft and durable cathodic interface via PEG hybridization in a ZnO layer is an effective strategy toward flexible electronics and commercialization...Continue Reading

References

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Aug 19, 2015·ACS Applied Materials & Interfaces·Yuanhang ChengSai-Wing Tsang
Jan 7, 2016·Nature Communications·Yicheng ZhaoQing Zhao
Feb 19, 2016·ACS Applied Materials & Interfaces·Dong Hun SinKilwon Cho

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Citations

Apr 17, 2019·Advanced Science·Licheng TanYongfang Li
Feb 1, 2020·ACS Applied Materials & Interfaces·Masoud PayandehBahram Abdollahi Nejand
Sep 25, 2017·ACS Applied Materials & Interfaces·Xian HouXiaohong Chen

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