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Benzodithiophene-Thienopyrroledione-Thienothiophene-based Random Copolymeric Hole Transporting Material for Perovskite Solar Cell
摘要： Hole transport materials (HTMs) with different hole extraction abilities play an important role in dictating the efficiency of the perovskite solar cells (PSCs). Besides, employing a donor acceptor (D-A) random copolymer HTM to bring out deeper HOMO energy level is highly beneficial to the hole extraction and durability of PSCs. In this context, a highly soluble D-A based random copolymeric benzodithiophene-thienopyrroledione-Thienothiophene derivatives (RCP-BTT) HTM has been derived from the backbone structure of Poly({4,8-bis[(2ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PTB7). The synthesized dopant-free RCP-BTT HTM shows a deeper HOMO energy level (-5.28 eV) due to its high compatibility than PTB7 level (-5.15 eV) based on perovskite energy level. Gradient band alignment of RCP-BTT has provided efficient hole extraction in the PSCs made of Cs-containing triple cation perovskite as absorber resulting in the efficient photovoltaic performance of RCP-BTT. The RCP-BTT with dopant shows significantly increased Voc (1.09 V) with respect to that of parent PTB7 (Voc of 1.06 V), resulting in an enhanced efficiency of 14.57% than that of PTB7 (12.02%). On the whole, the improvement in photovoltaic performance of PSC based on the polymeric RCP-BTT HTM is attributable to its deeper HOMO energy level and exceptional hole extraction ability.
关键词： Random copolymer,band alignment,mixed cation,hole extraction,perovskite solar cells
更新于2025-09-11 14:15:04
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Phase-separated structures of random methacrylate copolymers with pendant POSS moieties
摘要： The phase separation of random methacrylate copolymers with the pendant polyhedral oligomeric silsesquioxanes (POSS) moieties was studied. For the random copolymers of the phenyl-substituted POSS methacrylate (PhPOSSMA) and butyl methacrylate (BMA), the layer-like phase-separated structures were obtained from the copolymers with over circa 20 wt % of PhPOSSMA after thermal annealing in the bulk. The copolymers with larger PhPOSSMA content over 40 wt % showed periodic phase-separated structure with the periodic length ranging from 9.0 to 5.1 nm depending on the composition. The phase separation did not occur by solvent annealing in the bulk. On the other hand, no phase-separated structure was formed from the random copolymer with circa 50 wt % of isobutyl-substituted POSSMA (i-BuPOSSMA) and BMA after thermal annealing. In addition, the phase separation did not occur for both of the random copolymers of PhPOSSMA and i-BuPOSSMA with methyl methacrylate. The resulting phase-separated structures were well characterized by using wide-angle X-ray scattering, small-angle X-ray scattering, and transmission electron microscopy image.
关键词： random copolymer,POSS,phase-separated structure,thermal annealing,poly(methacrylate)
更新于2025-09-10 09:29:36