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Media type:
E-Article
Title:
A hybrid planar-mixed tetraphenyldibenzoperiflanthene/C70 photovoltaic cell
Contributor:
Xiao, Xin;
Zimmerman, Jeramy D.;
Lassiter, Brian E.;
Bergemann, Kevin J.;
Forrest, Stephen R.
Published:
AIP Publishing, 2013
Published in:
Applied Physics Letters, 102 (2013) 7
Language:
English
DOI:
10.1063/1.4793195
ISSN:
0003-6951;
1077-3118
Origination:
Footnote:
Description:
We describe a hybrid planar-mixed heterojunction (PM-HJ) organic photovoltaic cell based on tetraphenyldibenzoperiflanthene (DBP) and C70 with a power conversion efficiency of up to 6.4% ± 0.3%. Optimized cells consist of a DBP:C70 mixed layer at a volume ratio of 1:8 and a 9-nm thick C70 cap layer. The external quantum efficiency (EQE) in the visible of the PM-HJ cell is up to 10% larger than the mixed-HJ cell that lacks a C70 acceptor cap layer. The improvement in EQE is attributed to reduced exciton quenching at the MoO3 anode buffer layer surface. This leads to an internal quantum efficiency >90% between the wavelengths of λ = 450 nm and 550 nm, suggesting efficient exciton dissociation and carrier extraction in the PM-HJ cell. The power conversion efficiency under simulated AM 1.5G, 1 sun irradiation increases from 5.7% ± 0.2% for the mixed-HJ cell to 6.4% ± 0.3% for the PM-HJ cell, with a short-current density of 12.3 ± 0.3 mA/cm2, open circuit voltage of 0.91 ± 0.01 V, and fill factor of 0.56 ± 0.01.