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2018 ; 5
(3
): 1700675
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gab.com Text
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English Wikipedia
Compositionally Graded Absorber for Efficient and Stable
Near-Infrared-Transparent Perovskite Solar Cells
#MMPMID29593970
Fu F
; Pisoni S
; Weiss TP
; Feurer T
; Wäckerlin A
; Fuchs P
; Nishiwaki S
; Zortea L
; Tiwari AN
; Buecheler S
Adv Sci (Weinh)
2018[Mar]; 5
(3
): 1700675
PMID29593970
show ga
Compositional grading has been widely exploited in highly efficient
Cu(In,Ga)Se(2), CdTe, GaAs, quantum dot solar cells, and this strategy has the
potential to improve the performance of emerging perovskite solar cells. However,
realizing and maintaining compositionally graded perovskite absorber from
solution processing is challenging. Moreover, the operational stability of graded
perovskite solar cells under long-term heat/light soaking has not been
demonstrated. In this study, a facile partial ion-exchange approach is reported
to achieve compositionally graded perovskite absorber layers. Incorporating
compositional grading improves charge collection and suppresses interface
recombination, enabling to fabricate near-infrared-transparent perovskite solar
cells with power conversion efficiency of 16.8% in substrate configuration, and
demonstrate 22.7% tandem efficiency with 3.3% absolute gain when mechanically
stacked on a Cu(In,Ga)Se(2) bottom cell. Non-encapsulated graded perovskite
device retains over 93% of its initial efficiency after 1000 h operation at
maximum power point at 60 °C under equivalent 1 sun illumination. The results
open an avenue in exploring partial ion-exchange to design graded perovskite
solar cells with improved efficiency and stability.