Light Harvesting and Charge Recombination in CH3NH3PbI3 Perovskite Solar Cells Studied by Hole Transport Layer Thickness Variation

ACS Nano
Nevena MarinovaMichael Grätzel

Abstract

A tailored optimization of perovskite solar cells requires a detailed understanding of the processes limiting the device efficiency. Here, we study the role of the hole transport layer (HTL) spiro-MeOTAD and its thickness in a mesoscopic TiO2-based solar cell architecture. We find that a sufficiently thick (200 nm) HTL not only increases the charge carrier collection efficiency but also the light harvesting efficiency. This is due to an enhanced reflection of a smooth HTL/Au-electrode interface. The rough CH3NH3PbI3 perovskite surface requires an HTL thickness of >400 nm to avoid surface recombination and guarantee a high open-circuit voltage. Analyses of the electroluminescence efficiency and the diode ideality factor show that the open-circuit voltage becomes completely limited by trap-assisted recombination in the perovskite for a thick HTL. Thus, spiro-MeOTAD is a very good HTL choice from the device physics' point of view. The fill factor analyzed by the Suns-Voc method is not transport limited, but trap-recombination limited as well. Consequently, a further optimization of the device has to focus on defects in the polycrystalline perovskite film.

References

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Citations

Jan 29, 2016·ACS Applied Materials & Interfaces·Bo LiGuozhong Cao
Dec 1, 2015·ACS Applied Materials & Interfaces·Insung HwangKijung Yong
Apr 20, 2016·ACS Applied Materials & Interfaces·Darren C J NeoAndrew A R Watt
Jul 21, 2016·Journal of the American Chemical Society·T Jesper JacobssonAnders Hagfeldt
Oct 22, 2015·ACS Applied Materials & Interfaces·Shen WangYing Shirley Meng
Oct 7, 2016·Physical Chemistry Chemical Physics : PCCP·Manuel SaladoShahzada Ahmad
Feb 18, 2017·ACS Applied Materials & Interfaces·Haejun YuJyongsik Jang
May 13, 2017·ACS Applied Materials & Interfaces·Dong Hun SinKilwon Cho
Jun 27, 2017·ACS Applied Materials & Interfaces·Seojun Lee, Dong-Won Kang
Sep 9, 2017·Advanced Materials·Xiaotian HuYanlin Song
Jan 15, 2016·Science Advances·Dongqin BiAnders Hagfeldt
Jan 24, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Hooman Mehdizadeh-Rad, Jai Singh
Aug 29, 2019·Materials·Hooman Mehdizadeh-Rad, Jai Singh
Oct 12, 2017·ACS Applied Materials & Interfaces·Irene GrillAchim Hartschuh
Nov 2, 2019·ACS Applied Materials & Interfaces·Hossein TaherianfardMahdi Malekshahi Byranvand
Aug 21, 2019·ACS Applied Materials & Interfaces·Zhen SongYiying Zhao
Oct 28, 2021·ACS Applied Materials & Interfaces·Yanyan LiQianqian Lin

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