DGIST Scholar: Improved efficiency of bulk heterojunction poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester photovoltaic devices using discotic liquid crystal additives

Intelligent Devices and Systems Research Group 1. Journal Articles

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Improved efficiency of bulk heterojunction poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester photovoltaic devices using discotic liquid crystal additives

Title: Improved efficiency of bulk heterojunction poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester photovoltaic devices using discotic liquid crystal additives

Author(s): Jeong, S[Jeong, Seonju] ; Kwon, Y[Kwon, Younghwan] ; Choi, BD[Choi, Byeong-Dae] ; Ade, H[Ade, Harald] ; Han, YS[Han, Yoon Soo]

DGIST Authors: Jeong, S[Jeong, Seonju] ; Choi, BD[Choi, Byeong-Dae] ; Han, YS[Han, Yoon Soo]

Issued Date: 2010-05-03

Type: Article

Article Type: Article

Subject: Active Layer ; Additives ; Average Power ; Bulk-Heterojunction ; Butyric Acids ; Carrier Mobility ; Conversion Efficiency ; Discotic Liquid Crystal ; Esterification ; Esters ; Fatty Acids ; Heterojunctions ; High Efficiency ; High Mobility ; Liquid Crystals ; Methyl Esters ; Organic Photovoltaics ; Photovoltaic Devices ; Photovoltaic Effects ; Poly (3-Hexylthiophene) ; Self-Assembling Ability ; Solar Illumination ; Thermal-Annealing

ISSN: 0003-6951

Abstract: Well established poly(3-hexylthiophene):[6,6]-phenyl- C61 -butyric acid methyl ester (P3HT: PC61 BM) bulk-heterojunction organic photovoltaics (BHJ OPVs) were improved by incorporating a small portion of the discotic liquid crystal (DLC) additives with a strong self-assembling ability and high mobility. Under simulated solar illumination of AM 1.5 (100 mW/ cm2), the devices fabricated using P3HT: PC61 BM (1:1.2 w:w) layer blended with 3 wt % of 2,3,6,7,10,11-hexaacetoxytriphenylene (DLC 2) achieved an average power conversion efficiency (PCE) of 3.97% after thermal annealing, compared to the reference cells with PCE=3.03%. DLCs have been proven here to be a promising new type of additive that can remain embedded in the active layer of high efficiency P3HT: PC61 BM BHJ OPVs. © 2010 American Institute of Physics.