Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 13, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3242006
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Funding
- National Taiwan University
- Academia Sinica
- National Science Council of Republic of China
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This work presents an approach for improving the unfavorable vertical composition gradients of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C-61 butyric acid methyl ester (PCBM) in the photoactive layer of bulk heterojunction solar cells. The proposed method involves simply depositing a thin layer of P3HT on top of poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) prior to the P3HT:PCBM blend is spin coated. The results from photoluminescence and photovoltaic measurements indicate that incorporating this P3HT layer significantly enhances the electron blocking ability of PEDOT:PSS, the efficiency of photoinduced electron transfer and the photocurrent of the device, resulting in an improvement of the power conversion efficiency from 3.98% to 5.05%. (C) 2009 American Institute of Physics. [doi:10.1063/1.3242006]
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