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Direct Evaluation of Intrinsic Optoelectronic Performance of Organic Photovoltaic Cells with Minimizing Impurity and Degradation Effects
Author(s) -
Saeki Akinori,
Tsuji Masashi,
Seki Shu
Publication year - 2011
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201100143
Subject(s) - materials science , photovoltaic system , optoelectronics , impurity , photoconductivity , annealing (glass) , charge carrier , energy conversion efficiency , electron mobility , polymer solar cell , degradation (telecommunications) , heterojunction , organic solar cell , chemical engineering , polymer , composite material , electronic engineering , organic chemistry , electrical engineering , chemistry , engineering
A correlation between the photovoltaic performance and dynamics of transient photoconductivity is investigated by flash‐photolysis time‐resolved microwave conductivity (FP‐TRMC). This electrode‐less technique offers chances to mitigate barriers for direct, speedy, and robust evaluation of bulk heterojunction (BHJ) film. We examined the blend ratio, process (solvent and thermal annealing), and impurity (a metal complex of Pd) and degradation effects in BHJ films consisting of poly(3‐hexylthiophene) (P3HT) and methanofullerene (PCBM). The minimum charge carrier mobility of 0.22 cm 2 V −1 s −1 was found in P3HT:PCBM = 1:1 film along with 3.26% power conversion efficiency. The revealed good correlation is not only applicable to process optimization, but also expected as a facile screening method to survey the potential of optoelectronic materials.