Kim, Ji-Hoon Song, Chang Eun Shin, Nara Kang, Hyunbum Wood, Sebastian Kang, In-Nam Kim, Bumjoon J. Kim, BongSoo Kim, Ji-Seon Shin, Won Suk Hwang, Do-Hoon 2024-01-20T11:00:48Z 2024-01-20T11:00:48Z 2021-09-05 2013-12-25 1944-8244 https://pubs.kist.re.kr/handle/201004/127318 Two semiconducting conjugated polymers were synthesized via Stille polymerization. The structures combined unsubstituted or (triisopropylsilyl)ethynyl (TIPS)-substituted 2,6-bis(trimethylstannyl)benzo[1,2-b':4.5-bldithiophene (BDT) as a donor unit and benzotriazole with a symmetrically branched alkyl side chain (DTBTz) as an acceptor unit. We investigated the effects of the different BDT moieties on the optical, electrochemical, and photovoltaic properties of the polymers and the film crystallinities and carrier mobilities. The optical-band-gap energies were measured to be 1.97 and 1.95 eV for PBDT-DTBTz and PTIPSBDT-DTBTz, respectively. Bulk heterojunction photovoltaic devices were fabricated and power conversion efficiencies of 5.5% and 2.9% were found for the PTIPSBDT-DTBTz- and PBDT-DTBTz-based devices, respectively. This difference was explained by the more optimal morphology and higher carrier mobility in the PTIPSBDT-DTBTz-based devices. This work demonstrates that, under the appropriate processing conditions, TIPS groups can change the molecular ordering and lower the highest occupied molecular orbital level, providing the potential for improved solar cell performance. English American Chemical Society OPEN-CIRCUIT VOLTAGE SOLAR-CELLS SEMICONDUCTING POLYMERS RATIONAL DESIGN SIDE-CHAINS PERFORMANCE COPOLYMERS ACCEPTOR DIKETOPYRROLOPYRROLE DITHIENOSILOLE High-Crystalline Medium-Band-Gap Polymers Consisting of Benzodithiophene and Benzotriazole Derivatives for Organic Photovoltaic Cells Article 10.1021/am401926h 1 ACS Applied Materials & Interfaces, v.5, no.24, pp.12820 - 12831 ACS Applied Materials & Interfaces 5 24 12820 12831 scie scopus 000329137400009 2-s2.0-84891414221 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article OPEN-CIRCUIT VOLTAGE SOLAR-CELLS SEMICONDUCTING POLYMERS RATIONAL DESIGN SIDE-CHAINS PERFORMANCE COPOLYMERS ACCEPTOR DIKETOPYRROLOPYRROLE DITHIENOSILOLE organic photovoltaic device medium-band-gap polymer (triisopropylsily)ethynyl-substituted benzodithiophene 2D-GIXS resonant Raman spectroscopy