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Unraveling the Dual-Functional Mechanism of Light Absorption and Hole Transport of Cu2CdxZn1–xSnS4 for Achieving Efficient and Stable Perovskite Solar Cells
journal contribution
posted on 2020-04-01, 16:06 authored by Yanjie Wu, Wenbo Bi, Zhichong Shi, Xinmeng Zhuang, Zonglong Song, Shuainan Liu, Cong Chen, Lin Xu, Qilin Dai, Hongwei SongBroadening
the near-infrared (NIR) spectrum of device is critical
to further improve the power conversion efficiency (PCE) of the perovskite
solar cells (PSCs). In this work, novel Cu2CdZn1–xSnS4 (CZTS:Cd) film prepared by thermal
evaporation method was employed as the NIR light-harvesting layer
to complement the absorption of the perovskite. At the same time,
Au nanorods (NRs) were introduced into the hole-transporting layer
(HTL) to boost the utilization of CZTS:Cd to NIR light through localized
surface plasmon effect. The perovskite/CZTS:Cd and Au NR-integrated
PSCs can extend the photoelectric response to 900 nm. And more, the
well-matched energy levels between CZTS:Cd and perovskite can effectively
extract holes from perovskite and depress the charge carrier recombination.
As a result, the champion PSC device insulating with CZTS:Cd and Au
NRs demonstrates a remarkably increased PCE from 19.30 to 21.11%.
The modified PSC devices also demonstrate highly improved long-time
stability. The device retains a PCE of 87% after 500 h even under
air with a relative humidity of 85%, implying the superior humidity
stability of the devices with CZTS:Cd. This work suggests that perovskite/inorganic-integrated
structure is a promising strategy to broaden and boost the NIR response
of the PSCs.
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Keywords
well-matched energy levels500 hLight AbsorptionCZTSNIR light-harvesting layerNIR responsepower conversion efficiencyDual-Functional MechanismPCEStable Perovskite Solar Cells Broadeningsurface plasmon effectHole Transportcharge carrier recombinationHTLevaporation methodhole-transporting layerchampion PSC devicePSC devicesphotoelectric response900 nmhumidity stabilityNR-integrated PSCsperovskiteNIR light
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