Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 22, Pages 4383-4387Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00003j
Keywords
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Funding
- National Basic Research Program of China [2012CB934200, 2014CB643503]
- National Natural Science Foundation of China [50990064, 61076009, 61204002, 61072014, 21021091]
- 973 Program [2011CB932304, 2014CB643606]
- Chinese Academy of Sciences
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By inserting a PCBM (phenyl-C61-butyric acid methyl ester) layer between a P3HT (poly(3-hexylthiophene)):PCBM blend and a Ca/Al cathode, the performance of P3HT:PCBM bulk-heterojunction polymer solar cells is greatly improved. The maximum power conversion efficiency reached 4.24%, which is much higher than that of the traditional standard P3HT:PCBM based device (3.57%). By exploring various experimental techniques including absorption spectroscopy, X-ray photoelectron spectroscopy and impedance spectroscopy, we have found that the enhancement of the device performance can mainly be attributed to two reasons: (1) the inserted-PCBM layer can enhance the overall light absorption of the whole device and hence improve the photocurrent. (2) The inserted-PCBM layer can increase the amount of PCBM at the interface between the active layer and the cathode electrode, and hence suppress carrier recombination and facilitate electron extraction.
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