Enhancing Device Performance of Small Molecular Organic Photovoltaic Cells by Controlling the Deposition Rate of Fullerene. Issue 2 (22nd October 2012)

• Record Type: Journal Article
• Authors: Liu, Shun‐Wei; Lee, Chih‐Chien; Su, Wei‐Cheng; Lin, Chi‐Feng; Chou, Chia‐Chang
• Is Part Of: Journal of the Chinese Chemical Society. Volume 60:Issue 2(2013:Feb.)
• Page Start: 160
• Page End: 165
• Publication Date: 2012-10-22
• Subjects: Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.201200118
• Languages: English
• ISSNs: 0009-4536

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>To improve the power conversion efficiency (PCE) of small molecular weight organic photovoltaic cells (OPVs) it is proposed to use a simple fabrication method by controlling the deposition rate of the acceptor material fullerene (C₆₀) in planar heterojunction OPV structures of ITO/poly(3, 4‐ethylenedioxythiophene):poly(styrenesulfonate)/copper phthalocyanine (CuPc)/C₆₀/bathocuproine (BCP)/Ag. In our optimised device, the highest PCE of 1.7% was obtained through a deposition rate of C60 equal to 0.3 nm/s due to the superior charge balance in the CuPc/C₆₀ heterojunction. Such a charge balance condition increased the fill factor from 52.4% to 56.1% by reducing the carrier accumulation in the OPV device. The electron only device was fabricated with the purpose of analysing the electron mobility of C₆₀ as a function of the deposition rate. In addition, the effects of the deposition rates on the performance of planar OPV devices were exhaustively analysed by examining the absorption properties and the surface morphologies.</p> </abstract>