Synthesis and photovoltaic properties of two new alkoxylphenyl substituted thieno[2,3-f]benzofuran based polymers

Abstract

Two new alkoxylphenyl substituted thieno[2,3-f]benzofuran (TBFP)-based polymers (PTBFP-BT and PTBFP-BO) were designed and synthesized. Their structures were verified by nuclear magnetic resonance (NMR) spectroscopy, the molecular weights were determined by gel permeation chromatography (GPC) and the thermal properties were investigated by thermogravimetric analysis (TGA). The two polymers showed similar UV-Vis absorption spectra with a broad and strong absorption band from 300-750 nm in solid state. The resulting copolymers exhibited relatively deep highest occupied molecular orbital (HOMO) energy levels (-5.47 and -5.61 eV) for PTBFP-BT and PTBFP-BO, respectively. The device fabricated with PTBFP-BT : PC71BM (1 : 2) showed better balanced hole and electron mobility of 2.49 × 10(-4) cm(2) V(-1) s(-1) and 9.12 × 10(-4) cm(2) V(-1) s(-1), respectively, than those of PTBFP-BO based devices. The polymer solar cells (PSCs), based on the single layer device structure of ITO/PEDOT:PSS/PTBFP-BT : PC71BM (1 : 2, w/w)/ZrAcac/Al with 3 vol% 1,8-diiodooctane (DIO) as additive, showed a relatively high power conversion efficiency (PCE) of 6% under the illumination of AM 1.5G, 100 mW cm(-2), with a high fill factor (FF) of 0.69.

Recent Advances of Furan and Its Derivatives Based Semiconductor Materials for Organic Photovoltaics

“…At the same year, two copolymers PTBF3 and PTBF4 were synthesized based on alkoxylphenyl substituted TBF. [ 272 ] PTBF3 exhibited a higher PCE (6.02%) than PTBF4 (4.41%) since the former owned higher hole mobility and better compatibility with the acceptor. To further improve the performance, they modified the polymers PTBF3 and PTBF4 by introducing fluorine substituent on the phenyl side chain of TBF, affording two new copolymers ( PTBF5 and PTBF6 ).…”

Research Progress of the FuranContaining Fused Ring Conjugated Organic Molecules and Polymers

“…2015 年, 我们课题组 [58] 又报道了在 TBF 核上引入 带烷氧链苯基团的 TBFP, 将其与不同的受体单元聚合, 得到了 PTBFP-BT 和 PTBFP-BO (P32 和 P33), 如图 40, 它们与 PC 71 BM 混合得到的 SCLC 空穴迁移率分别为 9.…”

Solubilized 5,6-bis(octyloxy)benzoxadiazole as a versatile acceptor block for designing novel (-X-DADAD-)n and (-X-DADADAD-)n electron donor copolymers for bulk heterojunction organic solar cells

“…Additionally, BO-based polymers usually are more crystalline and demonstrate higher charge carrier mobilities in comparison with the BT-based analogues [18,19]. However, a high crystallinity might also cause low solubility of the BO-containing polymers challenging their processing and leading to a non-optimal morphology of the polymer-fullerene blend films [20,21,22]. This problem was partially solved by application of soluble 5,6-bis(alkoxy)-substituted BO as an acceptor block [23,24].…”