TY - JOUR
T1 - Ionic liquid-mediated reconstruction of perovskite surface for highly efficient photovoltaics
AU - Lee, Ji Hyeon
AU - Nketia-Yawson, Benjamin
AU - Lee, Jae Joon
AU - Jo, Jea Woong
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10/15
Y1 - 2022/10/15
N2 - To achieve efficient harvesting of light energy, perovskite photovoltaics require a surface passivation process of the perovskite layer. In this study, 1-butylmethylimidazolium hexafluorophosphate ionic liquid was adopted as a surface modifier to passivate a perovskite layer through post-treatment. Results revealed that the ionic liquid effectively reduces surface traps by inducing simultaneous interactions from both cation and anion components. Consequently, the surface treatment with the ionic liquid provided a ∼ 15% improvement in the efficiency of the perovskite photovoltaics. However, the formation of perovskite–ionic liquid complex, leading to inefficient charge transport and extraction, was observed when an excess amount of the ionic liquid was used owing to the penetration of the ionic liquid into the photo-active layer. These observations suggest that the ionic liquid should be selectively exposed to the perovskite surface to optimize the efficiency of perovskite photovoltaics treated with ionic liquids.
AB - To achieve efficient harvesting of light energy, perovskite photovoltaics require a surface passivation process of the perovskite layer. In this study, 1-butylmethylimidazolium hexafluorophosphate ionic liquid was adopted as a surface modifier to passivate a perovskite layer through post-treatment. Results revealed that the ionic liquid effectively reduces surface traps by inducing simultaneous interactions from both cation and anion components. Consequently, the surface treatment with the ionic liquid provided a ∼ 15% improvement in the efficiency of the perovskite photovoltaics. However, the formation of perovskite–ionic liquid complex, leading to inefficient charge transport and extraction, was observed when an excess amount of the ionic liquid was used owing to the penetration of the ionic liquid into the photo-active layer. These observations suggest that the ionic liquid should be selectively exposed to the perovskite surface to optimize the efficiency of perovskite photovoltaics treated with ionic liquids.
KW - Hole selective contact
KW - Interface charge recombination
KW - Interface engineering
KW - Ionic liquid
KW - Perovskite photovoltaics
KW - Trap passivation
UR - http://www.scopus.com/inward/record.url?scp=85131918132&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.137351
DO - 10.1016/j.cej.2022.137351
M3 - Article
AN - SCOPUS:85131918132
SN - 1385-8947
VL - 446
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 137351
ER -