Synthesis and optical and photovoltaic properties of dithienosilole–dithienylpyridine and dithienosilole–pyridine alternate polymers and polymer–B(C6F5)3 complexes

Abstract

Donor-acceptor (D-A)-type alternate polymers were synthesized, with either dithienyldithienosilole or dithienosilole as the donor and pyridine as the acceptor, and they exhibited broad absorption peaks at approximately 520 nm. Complex formation of the polymers with B(C 6 F 5 ) 3 was examined, revealing even broader absorption peaks, with the edges red-shifted relative to the parent polymers. Blend films of the polymers and their complexes with PC 71 BM were applied as active layers in bulk heterojunction-type polymer solar cells, resulting in a power-conversion efficiency (PCE) of 0.25-1.33%. Treatment of TiO 2 electrodes with the polymer solutions led to the attachment of polymer on the TiO 2 surface. Using the resulting polymer-attached TiO 2 electrodes, dye-sensitized solar cells were fabricated with a PCE of 0.54-0.55%.

Synthesis of D–A polymers with a disilanobithiophene donor and a pyridine or pyrazine acceptor and their applications to dye-sensitized solar cells

“…Similar homo-coupling was observed in the synthesis of pDTSPy under the same conditions. 7 The spectrum also revealed small signals ascribed to terminal bromopyridyl units. The molecular weight calculated based on the integration of the terminal bromopyridyl protons was approximately 7000, in good agreement with that determined by GPC.…”

“…6 Py polymers pDTSTPyT and pDTSPy without disilane bonds were then examined and found to show slightly higher PCEs of 0.55% and 0.54%, respectively. 7 Recently, we introduced disilanobithiophene (DSBT) as a new donor component of conjugated D-A polymers, and demonstrated its application to bulk hetero-junction polymer solar cells. 8 In this paper, we report the synthesis of new D-A polymers with DSBT donor and pyridine or pyrazine (Py or Pz) acceptor.…”

B←N Coordination: From Chemistry to Organic Photovoltaic Materials

“…However, excessive equivalents of BCF would cause negative effects on the mobilities because of defect formation and structural disorder. [ 62 ] Improved understanding of Lewis acid doping drives the further applications of B Lewis acids to tune the performance of various optoelectronic devices, e.g., organic light‐emitting diodes (OLEDs), [ 63,64 ] organic field effect transistors (OFETs), [ 62,65,66 ] OPVs, [ 67,68 ] and perovskite solar cells (PSCs). [ 69,70 ] For example, upon coordinating with BCF, OLEDs based on polymer 16‐BCF showed red‐shifted emission and increased tune‐on voltage due to the lowered HOMO of 16‐BCF adduct, which elevated the hole injection barrier.…”

Comprehensive theoretical and experimental study of near infrared absorbing copolymers based on dithienosilole

“…The DTS unit was combined with various electron-accepting moieties including (albeit non-exhaustively) pyridine and dithienylpyridine, 13 tricoordinate boron units, 14 quinoxaline, 15 thienopyrrole-4,6-dione, 16 thiazolothiazole, 17 benzothiadiazole (BT) and 4,7-di(thiophen-2-yl)-2,1,3benzothiadiazole (DTBT), 18,19,20,21 and fluorobenzothiadiazole.…”