title: Temperature-dependent Schottky barrier in high-performance organic solar cells.
abstract: Organic solar cells (OSCs) have attracted great attention in the past 30 years, and the power conversion efficiency (PCE) now reaches around 10%, largely owning to the rapid material developments. Meanwhile with the progress in the device performance, more and more interests are turning to understanding the fundamental physics inside the OSCs. In the conventional bulk-heterojunction architecture, only recently it is realized that the blend/cathode Schottky junction serves as the fundamental diode for the photovoltaic function. However, few researches have focused on such junctions, and their physical properties are far from being well-understood. In this paper based on PThBDTP:PC71BM blend, we fabricated OSCs with PCE exceeding 10%, and investigated temperature-dependent behaviors of the junction diodes by various characterization including current-voltage, capacitance-voltage and impedance measurements between 70 to 290 K. We found the Schottky barrier height exhibits large inhomogeneity, which can be described by two sets of Gaussian distributions.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: National Center for Nanoscience and Technology, Beijing 100190, P.R. China.
authors.forename: Dan
authors.initials: D
authors.lastname: He
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Peng
authors.initials: P
authors.lastname: Mao
authors.affiliation: National Center for Nanoscience and Technology, Beijing 100190, P.R. China.
authors.forename: Jiamin
authors.initials: J
authors.lastname: Cao
authors.affiliation: National Center for Nanoscience and Technology, Beijing 100190, P.R. China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Liming
authors.initials: L
authors.lastname: Ding
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Jizheng
authors.initials: J
authors.lastname: Wang