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Roughening Conjugated Polymer Surface for Enhancing the Charge Collection Efficiency of Sequentially Deposited Polymer/Fullerene Photovoltaics

Title
Roughening Conjugated Polymer Surface for Enhancing the Charge Collection Efficiency of Sequentially Deposited Polymer/Fullerene Photovoltaics
Authors
Jang, YoonheeSeo, Ji-WonSeok, JeesooLee, Jung-YongKim, Kyungkon
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2015
Journal Title
POLYMERS
ISSN
2073-4360JCR Link
Citation
vol. 7, no. 8, pp. 1497 - 1509
Keywords
organic photovoltaicsbilayer organic photovoltaicssequential depositionordering agent
Publisher
MDPI AG
Indexed
SCIE; SCOPUS WOS scopus
Abstract
A method that enables the formation of a rough nano-scale surface for conjugated polymers is developed through the utilization of a polymer chain ordering agent (OA). 1-Chloronaphthalene (1-CN) is used as the OA for the poly(3-hexylthiophene-2,5-diyl) (P3HT) layer. The addition of 1-CN to the P3HT solution improves the chain ordering of the P3HT during the film formation process and increases the surface roughness of the P3HT film compared to the film prepared without 1-CN. The roughened surface of the P3HT film is utilized to construct a P3HT/fullerene bilayer organic photovoltaic (OPV) by sequential solution deposition (SqSD) without thermal annealing process. The power conversion efficiency (PCE) of the SqSD-processed OPV utilizing roughened P3HT layer is 25% higher than that utilizing a plain P3HT layer. It is revealed that the roughened surface of the P3HT increases the heterojunction area at the P3HT/fullerene interface and this resulted in improved internal charge collection efficiency, as well as light absorption efficiency. This method proposes a novel way to improve the PCE of the SqSD-processed OPV, which can be applied for OPV utilizing low band gap polymers. In addition, this method allows for the reassessment of polymers, which have shown insufficient performance in the BSD process.
DOI
10.3390/polym7081466
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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