npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2015; 65: 741-746

Published online August 31, 2015

Copyright © New Physics: Sae Mulli.

Study of Solution-processable Bilayer Polymer Solar Cells

Jihoon LEE, Dal Yong LEE, Sung Heum PARK*

Department of Physics, Pukyong National University, Busan 609-735, Korea


Received: April 30, 2015; Revised: June 18, 2015; Accepted: June 21, 2015

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this work, we investigated the formation of a solution-processable bilayer polymer solar cell by using an orthogonal solvent. The orthogonal solubility of poly(3-hexylthiophene)(P3HT) used as an a donor material in dichloromethane facilitated the fabrication of a completely separate [6,6]-phenly-C$_{61}$-butyric acid methyl ester (PCBM) film on the underlying P3HT film. After the P3HT/PCBM bilayer had been generated, we improved the device's performance by optimizing the processing parameters including the choice of the solvent and the concentration of the P3HT solution. We also compared the characteristics of the solution-processable bilayer polymer solar cell with those of bulk-heterojunction polymer solar cells.

Keywords: Organic solar cell, bilayer cell, P3HT, PCBM, orthogonal solvent


Fig. 1. Device structure (a), Energy level diagram (b) of bilayer device. J-V characteristics of bilayer solar cells with various solvents (c) and concentration (d). J-V charcteristics (e) and IPCE spectra (f) of bilayer and BHJ solar cell.

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