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An easily accessible donor-π-acceptor conjugated small molecule from 4, 8-dialkoxy-benzo[1,2-b:4,5-b']dithiophene unit for efficient solution processed organic solar cells.
MedLine Citation:
PMID:  23148515     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A new D-A conjugated organic small molecule, BDT(TBT)2 comprised of benzo[1,2-b:4,5-b']dithiophene and 2,1,3-benzothiadiazole units was designed and synthesized. The small molecule BDT(TBT)2 in its thin film showed absorption band in the range of 300-700 nm with absorption maxima at 650 nm and an optical band gap of 1.90 eV. As estimated from the cyclic voltammetry measurements, the HOMO and LUMO energy levels of BDT(TBT)2 were -5.44 eV and -3.37 eV respectively. The spin-coated thin film of BDT(TBT)2 exhibited p-channel output characteristics with hole mobility of 2.7  10-6. BDT(TBT)2 when explored as electron donor material in solution processed bulk-heterojunction organic solar cells in conjunction with PC71BM acceptor with an active layer thickness of 50-55 nm, a power conversion efficiency (PCE) of 1.18% was generated. More impressive PCE of ~2.9% with a short circuit current density (Jsc) of 7.94 mA cm-2 and an open circuit voltage (Voc) of 0.89 V was achieved when the active layer of the cell was annealed at higher temperature (~180 oC).
Authors:
Pranabesh Dutta; Jeongseok Kim; Seung Hun Eom; Woo Hyoung Lee; In-Nam Kang; Soo-Hyoung Lee
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  ACS Appl Mater Interfaces     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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