Lin, Ying Lim, Jung Ah Wei, Qingshuo Mannsfeld, Stefan C. B. Briseno, Alejandro L. Watkins, James J. 2024-01-20T15:31:19Z 2024-01-20T15:31:19Z 2021-08-31 2012-02-14 0897-4756 https://pubs.kist.re.kr/handle/201004/129543 We report the cooperative self-assembly of functionalized fullerenes and all conjugated block copolymers (BCPs) containing polythiophene derivatives in both segments to yield solar cells with well-defined nanostructures and enhanced morphological stability. Favorable hydrogen bonding interactions between the COOH-functionalized fullerene, bis-[6, 6]-phenyl C61-butyric acid (bis-PCBA), and the tetraethyleneglycol side chains of poly(3-hexylthiophene)-block-poly[3-(2,5,8,11-tetraoxadodecane)thiophene] (P3HT-b-P3TODT) allows for high loading of bis-PCBA (up to 40 wt % to the blend) within the P3TODT domains, while preserving the lamellar morphology. Characterization by grazing incidence small-angle X-ray scattering, electron microscopy, and atomic force microscopy indicates that the periods of the structures range between 24 and 29 nm depending on the bis-PCBA loading. The hydrogen bond interactions between bis-PCBA and P3TODT segments further suppress crystallization and macrophase separation of the fullerenes, even under harsh annealing conditions (150 degrees C for 12 h). Bulk heterojunction solar cells prepared using P3HT-b-P3TODT/bis-PCBA exhibit a photoconversion efficiency of 2.04%, which is greater than that of a reference system, P3HT-b-P3TODT/bis-PCBM. Accelerated aging experiments reveal enhanced thermal stability as a result of the limited translational mobility of COOH-functionalized fullerene in P3HT-b-P3TODT relative to devices prepared using bis-PCBM in P3HT-b-P3TODT or P3HT. We believe that cooperative assembly using strong noncovalent interactions is a general approach that can be used to improve the processing, morphological stability, and aging of organic and hybrid photovoltaic devices. English AMER CHEMICAL SOC HETEROJUNCTION SOLAR-CELLS TRIBLOCK COPOLYMER SURFACTANTS BLOCK-COPOLYMERS MICROPHASE SEPARATION REGIOREGULAR POLY(3-HEXYLTHIOPHENE) FULLERENE COMPOSITES CHARGE-TRANSPORT SIDE-CHAIN THIN-FILMS POLYMER Cooperative Assembly of Hydrogen-Bonded Diblock Copolythiophene/Fullerene Blends for Photovoltaic Devices with Well-Defined Morphologies and Enhanced Stability Article 10.1021/cm203706h 1 CHEMISTRY OF MATERIALS, v.24, no.3, pp.622 - 632 CHEMISTRY OF MATERIALS 24 3 622 632 scie scopus 000300129400028 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article HETEROJUNCTION SOLAR-CELLS TRIBLOCK COPOLYMER SURFACTANTS BLOCK-COPOLYMERS MICROPHASE SEPARATION REGIOREGULAR POLY(3-HEXYLTHIOPHENE) FULLERENE COMPOSITES CHARGE-TRANSPORT SIDE-CHAIN THIN-FILMS POLYMER diblock copolymer self-assembly morphology photovoltaic device hydrogen bonding supramolecular assembly