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A hybrid planar-mixed tetraphenyldibenzoperiflanthene/C70 photovoltaic cell

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5 Author(s)
Xiao, Xin ; Departments of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA ; Zimmerman, Jeramy D. ; Lassiter, Brian E. ; Bergemann, Kevin J.
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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.

Published in:

Applied Physics Letters  (Volume:102 ,  Issue: 7 )

Date of Publication:

Feb 2013

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