TY - JOUR
T1 - Efficient organic photovoltaic cells based on nanocrystalline mixtures of boron subphthalocyanine chloride and C 60
AU - Pandey, Richa
AU - Gunawan, Aloysius A.
AU - Mkhoyan, K. Andre
AU - Holmes, Russell J.
PY - 2012/2/8
Y1 - 2012/2/8
N2 - The electrical and structural behavior of uniformly mixed films of boron subphthalocyanine chloride (SubPc) and C 60 and their performance in organic photovoltaic cells is explored. Device performance shows a strong dependence on active-layer donor-acceptor composition, and peak efficiency is realized at 80 wt.% C 60. The origin of this C 60-rich optimum composition is elucidated in terms of morphological changes in the active layer upon diluting SubPc with C 60. While neat SubPc is found to be amorphous, mixed films containing 80 wt.% C 60 show clear nanocrystalline domains of SubPc. Supporting electrical characterization indicates that this change in morphology coincides with an increase in the hole mobility of the SubPc:C 60 mixture, with peak mobility observed at a composition of 80 wt.% C 60. Organic photovoltaic cells constructed using this optimum SubPc:C 60 ratio realize a power conversion efficiency of (3.7 ± 0.1)% under 100 mW cm -2 simulated AM1.5G solar illumination.
AB - The electrical and structural behavior of uniformly mixed films of boron subphthalocyanine chloride (SubPc) and C 60 and their performance in organic photovoltaic cells is explored. Device performance shows a strong dependence on active-layer donor-acceptor composition, and peak efficiency is realized at 80 wt.% C 60. The origin of this C 60-rich optimum composition is elucidated in terms of morphological changes in the active layer upon diluting SubPc with C 60. While neat SubPc is found to be amorphous, mixed films containing 80 wt.% C 60 show clear nanocrystalline domains of SubPc. Supporting electrical characterization indicates that this change in morphology coincides with an increase in the hole mobility of the SubPc:C 60 mixture, with peak mobility observed at a composition of 80 wt.% C 60. Organic photovoltaic cells constructed using this optimum SubPc:C 60 ratio realize a power conversion efficiency of (3.7 ± 0.1)% under 100 mW cm -2 simulated AM1.5G solar illumination.
KW - boron subphthalocyanine chloride
KW - bulk heterojunctions
KW - organic semiconductors
KW - photovoltaic devices
KW - solar cells
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U2 - 10.1002/adfm.201101948
DO - 10.1002/adfm.201101948
M3 - Article
AN - SCOPUS:84856716909
SN - 1616-301X
VL - 22
SP - 617
EP - 624
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 3
ER -