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Impermeable Inorganic Walls Sandwiching Photoactive Layer toward Inverted Perovskite Solar and Indoor-Photovoltaic Devices | | Jie Xu
; Jun Xi
; Hua Dong
; Namyoung Ahn
; Zonglong Zhu
; Jinbo Chen
; Peizhou Li
; Xinyi zhu
; Jinfei Dai
; Ziyang Hu
; Bo Jiao
; Xun Hou
; Jingrui Li
; Zhaoxin Wu
; | | Date: |
12 Oct 2020 | | Abstract: | Interfaces between the perovskite active layer and the charge-transport
layers (CTLs) play a critical role in both efficiency and stability of
halide-perovskite photovoltaics. One of the major concerns is that surface
defects of perovskite could cause detrimental nonradiative recombination and
material degradation. In this work, we addressed this challenging problem by
inserting ultrathin alkali-fluoride (AF) films between the tri-cation
lead-iodide perovskite layer and both CTLs. This bilateral inorganic walls
strategy makes use of both physical-blocking and chemical-anchoring
functionalities of the continuous, uniform and compact AF framework: on the one
hand, the uniformly distributed alkali-iodine coordination at the perovskite-AF
interfaces effectively suppresses the formation of iodine-vacancy defects at
the surfaces and grain boundaries of the whole perovskite film, thus reducing
the trap-assisted recombination at the perovskite-CTL interfaces and therewith
the open-voltage loss; on the other hand, the impermeable AF buffer layers
effectively prevent the bidirectional ion migration at the perovskite-CTLs
interfaces even under harsh working conditions. As a result, a power-conversion
efficiency (PCE) of 22.02% (certified efficiency 20.4%) with low open-voltage
deficit (< 0.4V) was achieved for the low-temperature processed inverted planar
perovskite solar cells. Exceptional operational stability (500 h, ISOS-L-2) and
thermal stability (1000 h, ISOS-D-2) were obtained. Meanwhile, a 35.7% PCE was
obtained under dim-light source (1000 lux white LED light) with the optimized
device, which is among the best records in perovskite indoor photovoltaics. | | Source: | arXiv, 2010.05679 | | Services: | Forum | Review | PDF | Favorites | |
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