Incorporating an inert polymer into the interlayer passivates surface defects in methylammonium lead halide perovskite solar cells

No Thumbnail Available
File version
Author(s)
Bi, Shiqing
Zhang, Xuning
Qin, Liang
Wang, Rong
Zhou, Jiyu
Leng, Xuanye
Qiu, Xiaohui
Zhang, Yuan
Zhou, Huiqiong
Tang, Zhiyong
Griffith University Author(s)
Primary Supervisor
Other Supervisors
Editor(s)
Date
2017
Size
File type(s)
Location
License
Abstract

The hysteresis effect and instability are important concerns in hybrid perovskite photovoltaic devices that hold great promise in energy conversion applications. In this study, we show that the power conversion efficiency (PCE), hysteresis, and device lifetime can be simultaneously improved for methylammoniumlead halide (CH3NH3PbI3-xClx) solar cells after incorporating poly(methyl methacrylate) (PMMA) into the PC61BM electron extraction layer (EEL). By choosing appropriate molecular weights of PMMA, we obtain a 30 % enhancement of PCE along with effectively lowered hysteresis and device degradation, adopting inverted planar device structure. Through the combinatorial study using Kelvin probe force microscopy, diode mobility measurements, and irradiation-dependent solar cell characterization, we attribute the enhanced device parameters (fill factor and open circuit voltage) to the surface passivation of CH3NH3PbI3-xClx, leading to mitigating charge trapping at the cathode interface and resultant Shockley-Read-Hall charge recombination. Beneficially, modified by inert PMMA, CH3NH3PbI3-xClx solar cells display a pronounced retardation in performance degradation, resulting from improved film quality in the PC61BM layer incorporating PMMA which increases the protection for underneath perovskite films. This work enables a versatile and effective interface approach to deal with essential concerns for solution-processed perovskite solar cells by air-stable and widely accessible materials.

Journal Title

Chemistry—A European Journal

Conference Title
Book Title
Edition
Volume

23

Issue

58

Thesis Type
Degree Program
School
Publisher link
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement
Item Access Status
Note
Access the data
Related item(s)
Subject

Chemical sciences

Science & Technology

Physical Sciences

Chemistry, Multidisciplinary

Chemistry

hysteresis

Persistent link to this record
Citation

Bi, S; Zhang, X; Qin, L; Wang, R; Zhou, J; Leng, X; Qiu, X; Zhang, Y; Zhou, H; Tang, Z, Incorporating an inert polymer into the interlayer passivates surface defects in methylammonium lead halide perovskite solar cells, Chemistry—A European Journal, 2017, 23 (58), pp. 14650-14657

Collections