Boosting photovoltaic performance of a benzobisthiazole based copolymer: a device approach using a zinc oxide electron transport layer

Solution processed thick film organic solar cells

“…P19, a polymer with the well-ordered face-on orientation, affords the maximum PCE of 7.5% and FF of 0.65 with the active layer thickness of 330 nm, and a PCE close to 6% with thick layers of up to 1000 nm. Saeki et al 126,127 reported a benzobisthiazole and a BT alternating copolymer, P20, in which the benzobisthiazole serves as a weak donor unit rather than an acceptor unit. The BHJ solar cells with inverted device configuration based on P20 can afford a high FF of 0.67 and a PCE of 6.5% with an active layer thickness of 210 nm.…”

Molecular engineering of benzothienoisoindigo copolymers allowing highly preferential face-on orientations

“…However, the high-performing BTIDG copolymer still includes some portions of edge-on contribution, suggestive of extra room for enhancing the portion of face-on orientated polymer crystallites where considerable improvement has been reported in both charge carrier transport and overall PCE of OPV devices. 13 In this work, we synthesized novel BTIDG-based copolymers in combination with benzobisthiazole (BBTz) 14,15 or thiazolothiazole (TzTz), 16,17 where BBTz and TzTz are normally electron acceptors but used as weak donors [18][19][20] against BTIDG. This molecular design is intended to provide both optimal E opt g (ideally 1.37-1.45 eV from the calculation) 21 and HOMO levels.…”

Ambipolar organic semiconductors with cascades of energy levels for generating long-lived charge separated states: a donor–acceptor1–acceptor2 architectural triarylamine dye

“…MTPA-TRC exhibits similar photovoltaic characteristics in Schottky organic solar cells with common organic semiconductors such as phthalocyane, poly(phenylene vinylene) and triarylamine derivatives, [33][34][35][36] of which the efficiency has been improved to 6% above and even exceeds 10% by the combined application of other semiconductors and the appropriate design of solar cell structures. [36][37][38][39][40] The far better photovoltaic characteristics of MTPA-TRC-AEAQ than those of MTPA-TRC suggests potential applications in solar cells.…”