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Novel unsymmetrical push-pull squaraine chromophores for solution processed small molecule bulk heterojunction solar cells
- Authors
- So, Seulgi; Choi, Hyunbong; Ko, Haye Min; Kim, Chulwoo; Paek, Sanghyun; Cho, Nara; Song, Kihyung; Lee, Jae Kwan; Ko, Jaejung
- Issue Date
- 3월-2012
- Publisher
- ELSEVIER
- Keywords
- Bulk heterojunction solar cell; Small molecule; Squaraine; Molecular engineering
- Citation
- SOLAR ENERGY MATERIALS AND SOLAR CELLS, v.98, pp.224 - 232
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLAR ENERGY MATERIALS AND SOLAR CELLS
- Volume
- 98
- Start Page
- 224
- End Page
- 232
- ISSN
- 0927-0248
- Abstract
- New unsymmetrical low band-gap push-pull squaraine chromophores, [TPA-bisHT-HP]-X-Ind [X: SQ, diCNSQ], which are composed of triphenylamine electron donating, pi-conjugated dithiophene-pyrrole bridging, and squaraine-indol electron withdrawing moieties, for their application in solution processed BHJ solar cell. The [TPA-bisHT-HP]-diCNSQ-Ind having the stronger electron withdrawing moiety exhibits significantly the red-shifted absorption spectrum due to its strong intramolecular charge transfer in solution as well as in solid-state. The bulk-heterojunction photovoltaic devices fabricated with [TPA-bisHT-HP]-diCNSQ-Ind/C-71-PCBM film exhibited a PCE of 2.05% (+/- 0.07) with short-circuit current (J(sc))=9.05 mA/cm(2), fill factor (FF)=0.33, and open-circuit voltage (V-oc)=0.69 V, which is similar to 3 times higher efficiency compared to [TPA-bisHT-HP]-SQ-Ind/C-71-PCBM BHJ films. (C) 2011 Elsevier B.V. All rights reserved.
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