High-Performance Semitransparent Bulk-Heterojunction Organic Photovoltaics with Ag Interfacial Layer

Semitransparent bulk-heterojunction organic photovoltaics with power conversion efficiency (PCE) of $1.63\pm 0.39$% was achieved by using poly(3-hexylthiophene) (P3HT)/phenyl-C 61 -butyric acid methyl ester (PCBM) active layer and Ag/Ca/Ag transparent cathode. Insertion of a thin Ag interfacial laye...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 51; no. 2; pp. 024104 - 024104-4
Main Authors Han, Jeong In, Park, Jun-Ki, Park, Sung Kyu
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.02.2012
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Summary:Semitransparent bulk-heterojunction organic photovoltaics with power conversion efficiency (PCE) of $1.63\pm 0.39$% was achieved by using poly(3-hexylthiophene) (P3HT)/phenyl-C 61 -butyric acid methyl ester (PCBM) active layer and Ag/Ca/Ag transparent cathode. Insertion of a thin Ag interfacial layer (1 nm) between the P3HT/PCBM active layer and Ca/Ag transparent cathode dramatically improved the PCE from $0.83\pm 0.33$ to $1.63\pm 0.39$% as well as other photovoltaic properties such as fill factor, short-circuit current, and series resistance. In this experiment, it is considered that the improved device performance is possibly due to improved contact property by the Ag interfacial layer at the active/cathode interface.
Bibliography:Schematic diagram of a cross-sectional image and an optical microscopic image of fabricated semitransparent OPV device with Ag/Ca/Ag cathode. Optical transmittance of (a) Ca/Ag bilayer cathode, and (b) semitransparent OPV device with Ag/Ca/Ag cathode in the visible region. $J$--$V$ characteristics of OPV devices with various cathode structures; (a) measured under AM 1.5G 100 mW/cm 2 illumination, and (b) measured under dark (inset: energy band diagram at PCBM/cathode interface). (a) Dark $I$--$V$ characteristics of OPV cells with different cathode structures. The $I$--$V$ curves were measured at voltage range from $-0.1$ to 0.1 V. (b) $I$--$V$ curve showing nonlinear characteristic of an OPV cell with Ca/Ag cathode. (a) Light absorption characteristics, and (b) atomic force microscope images of P3HT/PCBM active layers with and without 1 nm Ag interfacial layer.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.024104