Journal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume 597, Issue 1, Pages 135-145Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2014.932658
Keywords
Bulk heterojunction polymer solar cell; 5,10-dihydroindolo[3,2-b]indole (DINI); low-band gap polymers; benzothiadiazole
Funding
- Pusan National University Grant
- National Research Foundation of Korea [22A20130000173] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A series of donor-acceptor low band gap polymers (DINIBT-C8, DINIBT-C10 and DINIBT-EH) containing 5,10-dihydroindolo[3,2-b]indole (DINI) as an electron donating unit and benzothiadiazole (BT) as an electron accepting unit with various kinds of alkyl chains (octyl; C8, decyl; C10 and ethyl hexyl; EH) on the donor unit have been designed, synthesized, and characterized for bulk heterojunction polymer solar cell applications. Due to the presence of long alkyl chains on the donor unit, all the polymers showing good solubility in common organic solvents. The frontier orbital energy levels of polymers were calculated using cyclic voltametry analysis. The influence of alkyl chains on the photo-physical properties of polymers were carried out. Among the three polymers, the DINIBT-C8 shows higher absorption coverage and good energy level matching with acceptor PC71BM than that of the other two polymers. Thus, the bulk-heterojunction polymer solar cells (BHJ PSCs) were fabricated using DINIBT-C8:PC71BM as an active layer with the configuration of ITO/PEDOT/ DINIBT-C8:PC71BM/LiF/Al. The DINIBT-C8 shows the maximum PCE of 0.16%.
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