title: Decoupling Charge Transfer and Transport at Polymeric Hole Transport Layer in Perovskite Solar Cells.
abstract: Tailoring charge extraction interfaces in perovskite solar cells (PeSCs) critically determines the photovoltaic performance of PeSCs. Here, we investigated the decoupling of two major determinants of the efficient charge extraction, the charge transport and interfacial charge transfer properties at hole transport layers (HTLs). A simple physical tuning of a representative polymeric HTL, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), provided a wide range of charge conductivities from 10(-4) to 10(3) S cm(-1) without significant modulations in their energy levels, thereby enabling the decoupling of charge transport and transfer properties at HTLs. The transient photovoltaic response measurement revealed that the facilitation of hole transport through the highly conductive HTL promoted the elongation of charge carrier lifetimes within the PeSCs up to 3 times, leading to enhanced photocurrent extraction and finally 25% higher power conversion efficiency.
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Dong Hun
authors.initials: DH
authors.lastname: Sin
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Hyomin
authors.initials: H
authors.lastname: Ko
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Sae Byeok
authors.initials: SB
authors.lastname: Jo
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Min
authors.initials: M
authors.lastname: Kim
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Geun Yeol
authors.initials: GY
authors.lastname: Bae
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Kilwon
authors.initials: K
authors.lastname: Cho
keywords: charge carrier lifetime; charge transport; conductivity; hole transport layer; perovskite solar cells