jp504365y_si_001.pdf (4.68 MB)
Ternary Bulk Heterojunction Photovoltaic Cells Composed of Small Molecule Donor Additive as Cascade Material
journal contribution
posted on 2014-09-04, 00:00 authored by Lei Ye, Hai-Hua Xu, Hui Yu, Wang-Ying Xu, Hao Li, Han Wang, Ni Zhao, Jian-Bin XuTo explore the potential of ternary
blend bulk heterojunction (BHJ)
solar cells as a general platform for improving the performance of
organic photovoltaics, we studied a ternary BHJ system based on poly(3-hexylthiophene)
(P3HT), [6,6]-phenyl C61 butyric acid methyl ester (PC61BM), and DTDCTB. The optimized ternary structure containing a weight
ratio of 20% DTDCTB as the cascade material demonstrates a ∼25%
improvement of the power conversion efficiency (PCE) as compared to
the binary P3HT/PC61BM solar cells. A systematic spectroscopic
study is carried out to elucidate the underlying mechanism of charge
transfer in the ternary system. Wavelength-dependent external quantum
efficiency measurement confirms the contribution of DTDCTB to the
enhanced photocurrent. Photoinduced absorption spectroscopy and transient
photovoltage measurement reveal unambiguously that charges generated
in DTDCTB are efficiently transferred to and subsequently transported
in P3HT and PC61BM. The results also suggest that despite
the realization of cascade charge transfer, the bimolecular charge
recombination process in the ternary system is still dominated by
the P3HT/PC61BM interface.
History
Usage metrics
Categories
Keywords
Small Molecule Donor Additiveternary BHJ systempower conversion efficiencyPCEoptimized ternary structureternary blend bulk heterojunctionquantum efficiency measurementcascade charge transferternary systemDTDCTBPhotoinduced absorption spectroscopyTernary Bulk Heterojunction Photovoltaic Cells ComposedP 3HT interfaceP 3HTPC 61BMcharge recombination process
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC