Unraveling Doping Capability of Conjugated Polymers for Strategic Manipulation of Electric Dipole Layer toward Efficient Charge Collection in Perovskite Solar Cells
- Authors
- Park, Jaehong; Yoon, Sang Eun; Lee, Jongmin; Whang, Dong Ryeol; Lee, Sang Yeon; Shin, So Jeong; Han, Ji Min; Seo, Hyungtak; Park, Hui Joon; Kim, Jong H.; Kim, Bong-Gi
- Issue Date
- Jun-2020
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- conducting polymers; conjugated polymers; doping; molecular electronics; solar cells
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.30, no.24, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 30
- Number
- 24
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2581
- DOI
- 10.1002/adfm.202001560
- ISSN
- 1616-301X
- Abstract
- Developing electrical organic conductors is challenging because of the difficulties involved in generating free charge carriers through chemical doping. To devise a novel doping platform, the doping capabilities of four designed conjugated polymers (CPs) are quantitatively characterized using an AC Hall-effect device. The resulting carrier density is related to the degree of electronic coupling between the CP repeating unit and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), and doped PIDF-BT provides an outstanding electrical conductivity, exceeding 210 S cm(-1), mainly due to the doping-assisted facile carrier generation and relatively fast carrier mobility. In addition, it is noted that a slight increment in the electron-withdrawing ability of the repeating unit in each CP diminishes electronic coupling with F4-TCNQ, and severely deteriorates the doping efficiency including the alteration of operating doping mechanism for the CPs. Furthermore, when PIDF-BT with high doping capability is applied to the hole transporting layer, with F4-TCNQ as the interfacial doping layer at the interface with perovskite, the power conversion efficiency of the perovskite solar cell improves significantly, from 17.4% to over 20%, owing to the ameliorated charge-collection efficiency. X-ray photoelectron spectroscopy and Kelvin probe analyses verify that the improved solar cell performance originates from the increase in the built-in potential because of the generation of electric dipole layer.
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