TY - JOUR
T1 - Synergistic effect of potassium and iodine from potassium triiodide complex additive on gas-quenched perovskite solar cells
AU - Zhang, Meng
AU - Bing, Jueming
AU - Cho, Yongyoon
AU - Li, Yong
AU - Zheng, Jianghui
AU - Lau, Cho Fai Jonathan
AU - Green, Martin A.
AU - Huang, Shujuan
AU - Ho-Baillie, Anita W. Y.
PY - 2019/9
Y1 - 2019/9
N2 - Gas-quenching has been demonstrated to be a robust and reliable method for fabricating perovskite solar cell (PSCs) and is a technique for large area and large-scale production. Although additive engineering has been used to improve various perovskite fabrication methods, it is yet to be utilised by gas-quenching. Herein, we introduce potassium triiodide complex (KI3) as a novel additive to the perovskite precursor solution for gas-quenched PSCs. The resultant perovskite film exhibits broader spectral response, enhanced photoluminescence and prolonged carrier lifetime, due to halide exchange and defect passivation brought about by the I2 supplied by the KI3 complex. The champion device fabricated from precursor with mixed KI and KI3 additives delivered a steady-state power conversion efficiency of 21.2% with negligible hysteresis due to the presence of potassium salt. This efficiency is the highest for PSCs fabricated by gas-quenching. Moreover, the KI3 additive has substantially improved the stability of the precursor solution, allowing high performance devices to be fabricated with aged solution, which widens the process window for perovskite film deposition and lengthens the lifetime of precursors which are important prerequisites for large scale production of PSC.
AB - Gas-quenching has been demonstrated to be a robust and reliable method for fabricating perovskite solar cell (PSCs) and is a technique for large area and large-scale production. Although additive engineering has been used to improve various perovskite fabrication methods, it is yet to be utilised by gas-quenching. Herein, we introduce potassium triiodide complex (KI3) as a novel additive to the perovskite precursor solution for gas-quenched PSCs. The resultant perovskite film exhibits broader spectral response, enhanced photoluminescence and prolonged carrier lifetime, due to halide exchange and defect passivation brought about by the I2 supplied by the KI3 complex. The champion device fabricated from precursor with mixed KI and KI3 additives delivered a steady-state power conversion efficiency of 21.2% with negligible hysteresis due to the presence of potassium salt. This efficiency is the highest for PSCs fabricated by gas-quenching. Moreover, the KI3 additive has substantially improved the stability of the precursor solution, allowing high performance devices to be fabricated with aged solution, which widens the process window for perovskite film deposition and lengthens the lifetime of precursors which are important prerequisites for large scale production of PSC.
KW - Perovskite solar cells
KW - Gas quenching
KW - Halide exchange
KW - Defects passivation
KW - Stabilising precursor solution
UR - http://www.scopus.com/inward/record.url?scp=85067861211&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/DP160102955
U2 - 10.1016/j.nanoen.2019.06.049
DO - 10.1016/j.nanoen.2019.06.049
M3 - Article
AN - SCOPUS:85067861211
VL - 63
SP - 1
EP - 7
JO - Nano Energy
JF - Nano Energy
SN - 2211-2855
M1 - 103853
ER -