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

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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, Seonju ; Kwon, Younghwan ; Choi, Byeong-Dae ; Ade, Harald ; Han, Yoon Soo

Issued Date: 2010-05-03

Citation: Applied Physics Letters, v.96, no.18

Type: Article

Keywords: ABSORPTION ; Active Layer ; Additives ; Average Power ; Bulk Heterojunction ; Butyric ACIDs ; Carrier Mobility ; CHARGE-CARRIER MOBILITY ; CONVERSION ; Conversion Efficiency ; Discotic Liquid Crystal ; Esterification ; Esters ; Fatty ACIDs ; Heterojunctions ; High Efficiency ; High Mobility ; INTERPENETRATING NETWORK ; Liquid Crystals ; METHANofULLERENES ; Methyl Esters ; Morphology ; Organic Photovoltaics ; PHASE-SEPARATION ; PHOTOVOLTAIC DEVICES ; Photovoltaic Effects ; Poly (3-Hexylthiophene) ; POLY(3-HEXYLTHIOPHENE) ; POLYMER SOLAR-CELLS ; 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.