標題: High-mobility low-bandgap conjugated copolymers based on indacenodithiophene and thiadiazolo[3,4-c]pyridine units for thin film transistor and photovoltaic applications
作者: Sun, Ying
Chien, Shang-Chieh
Yip, Hin-Lap
Zhang, Yong
Chen, Kung-Shih
Zeigler, David F.
Chen, Fang-Chung
Lin, Baoping
Jen, Alex K. -Y.
光電工程學系
顯示科技研究所
Department of Photonics
Institute of Display
公開日期: 2011
摘要: Two new semiconducting polymers based on indacenodithiophene and thiadiazolo[3,4-c]pyridine units were synthesized via Stille coupling polymerization. The polymers, PIDTPyT and PIDTDTPyT, exhibited main absorption bands in the range of 550-800 nm while their absorption maxima were located at around 700 nm in films. With two additional thiophene spacers, PIDTDTPyT showed a broader absorption band but a 20 nm blue-shifted maximum peak compared to that of PIDTPyT. Both of the polymers possess low bandgaps (similar to 1.6 eV) and deep energy levels for both the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Organic field-effect transistors (OFETs) device measurements indicate that PIDTPyT and PIDTDTPyT have high hole carrier mobilities of 0.066 and 0.045 cm(2) V(-1) s(-1), respectively, with the on/off ratio on the order of 10(6). Bulk heterojunction photovoltaic devices consisting of the copolymers and PC(71)BM gave power conversion efficiencies (PCE) as high as 3.91% with broadband photo-response in the range of 300-800 nm. The relationships between the photovoltaic performance and film morphology, energy levels, hole mobilities are discussed.
URI: http://hdl.handle.net/11536/25930
http://dx.doi.org/10.1039/c1jm11564b
ISSN: 0959-9428
DOI: 10.1039/c1jm11564b
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 21
Issue: 35
起始頁: 13247
結束頁: 13255
顯示於類別:期刊論文


文件中的檔案:

  1. 000294176600018.pdf