npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2010; 60: 201-205

Published online February 27, 2010 https://doi.org/10.3938/NPSM.60.201

Copyright © New Physics: Sae Mulli.

Extraction of Electrical Parameters as functions of Post-annealing in Organic Solar Cells

Dongyoung KIM, Jihwan KIM, Hyejee LEE, Haejin KIM, Sunyoung SOHN, Jong-Jae KIM, Hwa-Min KIM*

Department of Electronics Engineering, Catholic University of Daegu, Gyeongsan 712-702

Correspondence to:hmkim@cu.ac.kr

Abstract

In this research, we studied the effects of post-annealing treatment on a poly(3-hexylthiophene)(P3HT, donor):[6,6]-phenyl C61 butyric acid methyl ester (PCBM, acceptor) blend film as an active layer in an organic photovoltaic (OPV) cell. From the XRD measurements among the thin films post-annealed at various temperatures, the P3HT:PCBM active layer post-annealed at various temperatures, compared with any other thermal treatment, showed improved P3HT crystallization and redistribution of PCBM clusters at the P3HT:PCBM interface. Also, the film post-annealed at 150 $^{\circ}$C had a carrier mobility of 4.5 × 10$^4$ cm$^2$/V.S, which was increased by about 10 times compared to that of the film without post-annealing (5.0 × 10$^3$ cm$^2$/V.S). The improved efficiency in the OPV after post-annealing treatment at 150 $^{\circ}$C can be explained by the improved electrical conductivity and crystallinity increasement and by the efficient separation or collection of the photogenerated excitons at the donor-acceptor interface caused by the improved P3HT crystallization.

Keywords: Organic photovoltaic cell, P3HT, PCBM, Post-annealing, Bulk heterojunction

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