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In this paper, the morphology evolution of [6,6]-phenyl-C-61(or 71)-butyric acid methyl ester (PC 61 BM or PC 71 BM) in poly(3-hexylthiophene) (P3HT) annealed at different temperatures was investigated. One result which was observed is that PCBM clusters aggregate more readily at higher annealing temperatures. The aggregation of PCBM could be avoided after coating the Al layer on the...
To lower the HOMO (highest occupied molecular orbital) energy level of polythieno[3,4-b]thiophene (∼−4.5eV), a series of ester-functionalized polythieno[3,4-b]thiophene derivatives (P1–P3) were designed and synthesized by Stille cross coupling reaction. The resulting copolymers exhibited broad and strong absorption bands from visible to near infrared region with low optical band gaps of 1.23–1.42eV...
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