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1.Jingbi You, Letian Dou, Ken Yoshimura, Takehito Kato, Kenichiro Ohya, Tom Moriarty, Keith Emery, Chun-Chao Chen, Jing Gao, Gang Li, and Yang Yang, “A polymer tandem solar cell with 10.6% power conversion efficiency,” Nat. Commun. 4, 1446-1-1446-10 (2013).
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Measurements of electrical conductivity, electron work function,carrier mobility of holes and the diffusion length of excitons were performed on samples of conjugated polymers relevant to polymersolar cells. A state of the art fluorinated benzothiadiazole based conjugated copolymer (PBDT − DTBTff) was studied and benchmarked against the reference polymer poly-3-hexylthiophene (P3HT). We employed, respectively, four electrode conductivity measurements, Kelvin probe work functionmeasurements,carrier mobility using charge extraction by linearly increasing voltage (CELIV) measurements and diffusion length determinaton using surface photovoltage measurements.


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