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Applied Physics Letters / Volume 96 / Issue 18 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 96, 183305 (2010); http://dx.doi.org/10.1063/1.3395391 (3 pages)

Improved efficiency of bulk heterojunction poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester photovoltaic devices using discotic liquid crystal additives

Seonju Jeong1, Younghwan Kwon2, Byeong-Dae Choi1, Harald Ade3, and Yoon Soo Han1

1Division of Nano-Bio Technology, DGIST, Daegu 704-230, Republic of Korea
2Department of Chemical Engineering, Daegu University, Gyeongsan, Gyeongbuk 712-714, Republic of Korea
3Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA

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(Received 31 December 2009; accepted 24 March 2010; published online 6 May 2010)

Well established poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) 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:PC61BM (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:PC61BM BHJ OPVs.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

annealing, discotic liquid crystals, liquid crystal devices, photovoltaic cells, polymer blends, self-assembly, solar cells

PACS

  • 88.40.H-

    Solar cells (photovoltaics)

  • 42.79.Kr

    Display devices, liquid-crystal devices

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3395391

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
Cascade-energy-level alignment and (J)-(V) characteristics of P3HT:PC61BM devices under an illumination of 100 mW/cm2 (AM 1.5); without additives (a) before and (b) after thermal treatment, with DLC 1 (c) before and (d) after thermal treatment, and with DLC 2 (e) before and (f) after thermal treatment.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
UV-Visible absorption spectra of P3HT:PC61BM blend films without and with DLC 1 and 2 before and after thermal treatment.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Supplemental Files (EPAPS)

Tables

Table I. Photovoltaic properties of BHJ OPVs based on P3HT:PC61BM with and without DLC additives before and after thermal annealing process.

View Table


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