Optical and ESR studies on poly(3-alkylthiophene)/fullerene composites for solar cellsстатья
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Дата последнего поиска статьи во внешних источниках: 8 июня 2022 г.
Аннотация:Optical measurements (absorption coefficients, photoluminescence) and light-induced electron spin resonance ( LESR ) technique was used to study on photoinduced charge generation and transfer in conjugated polymer / fullerene composites. The quenching of fluorescence by C 60 gives first information on the effective charge transfer from P3DDT to C 60 . At 77 K two kinds of LESR signal were identified one, from polaron ( P + ) on the polymer chains and anion radical ( C 60 - ) of the fullerene. The large difference of relaxation rates of created radicals were estimated by microwave power saturation studies. Moreover for the first center ( P + ) two contributions to the LESR were observed: a initial one and a photoinduced one. The light power dependence of the last contribution into the P + and C 60 - ESR signals is of bimolecular type ( I 0.5 ). Solar cells based on P3DDT/ C60 and P3DDT/ PCBM are prepared and characterised.