Development of a new benzo(1,2-b:4,5-b′)dithiophene-based copolymer with conjugated dithienylbenzothiadiazole–vinylene side chains for efficient solar cells

Abstract

A new benzodithiophene-based copolymer PTG1 with dithienylbenzothiadiazole-vinylene side chains exhibits excellent film-forming ability, a deep HOMO energy level, and a good miscibility with PC(71)BM. Bulk heterojunction polymer solar cells fabricated from PTG1 and PC(71)BM showed a promising power conversion efficiency over 4.0%.

Benzo[1,2‐b:4,5‐b′]dithiophene Building Block for the Synthesis of Semiconducting Polymers

“…[ 69 , 70 ] A copolymer of 4,8-dialkoxy benzo[1,2-b :4,5-b ′ ]dithiophene with 3-substituted thiophene with a conjugated side-chain dithienylbenzothiadiazole-vinylene displayed a highest effi ciency of 4.32% with PCBM acceptor and 1,8-diiodooctane additive. [ 70 ] Tian group synthesized a random copolymer of dialkoxy substituted BDT with bithiophenevinyl-2-pyran-4-ylidenemalononitrile and benzothiadiazole and achieved PCE up to 2.9%. [ 71 ] (Figure 7 ).…”

Synthesis of two-dimensional π-conjugated polymers pendent with benzothiadiazole and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole moieties for polymer solar cells

“…This polymer framework exhibited a 2D architecture [19,20] that typically showed excellent solubility, relatively deep highest occupied molecular orbital energy levels (E HOMO ), and a finely tunable energy band gap through intramolecular charge transfer (ICT) between the conjugated main chain and the side chain. As a result of these specific advantages, PSCs based on such side chain D-A polymers exhibited superior device performances [21][22][23][24][25][26][27][28][29][30][31].…”

Benzo[1,2-b:4,5-b′]dithiophene and benzotriazole based small molecule for solution-processed organic solar cells

“…The mixture was stirred at 90°C for 12 h, and then 40 mL water was added to quench the reaction [32]. The mixture was extracted with CH 2 Cl 2 .…”