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Modulation of light absorption by optical spacer in perovskite solar cells
Author(s) -
Kim Kangmin,
Jung Buyoung,
Kumar Neetesh,
Eom Yoomin,
Kim Woochul
Publication year - 2016
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201600037
Subject(s) - energy conversion efficiency , materials science , perovskite (structure) , optoelectronics , photoactive layer , heterojunction , absorption (acoustics) , exciton , perovskite solar cell , wavelength , optical power , optics , polymer solar cell , chemistry , laser , physics , quantum mechanics , composite material , crystallography
Lead halide perovskite solar cells with planar heterojunction configuration have recently attracted tremendous attention because of their excellent power conversion efficiencies. The modulation of optical absorption by using an optical spacer layer is a unique method to enhance the device efficiency. Here, we demonstrate the application of thin ZnO layer that act as an optical spacer that enhance the power conversion efficiency perovskite devices from 8.92% to 10.7%, which is mainly due to increment in short‐circuit current density by 16% compared to the reference solar cell. The simulation data revealed that ZnO acts as an optical spacer layer that shifts length (average) of electric field | E | 2 distribution from 500 nm to 750 nm wavelength is 25 nm in the perovskite layer. Which represents that exciton generation region is moved to near the hole transport layer that enhances the exciton dissociation efficiency and device efficiency.