A hybrid planar-mixed tetraphenyldibenzoperiflanthene/C70 photovoltaic cell

We describe a hybrid planar-mixed heterojunction (PM-HJ) organic photovoltaic cell based on tetraphenyldibenzoperiflanthene (DBP) and C-70 with a power conversion efficiency of up to 6.4% +/- 60.3%. Optimized cells consist of a DBP: C-70 mixed layer at a volume ratio of 1: 8 and a 9-nm thick C-70 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 C-70 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 lambda = 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% +/- 60.2% for the mixed-HJ cell to 6.4% 60.3% for the PM-HJ cell, with a short-current density of 12.360.3 mA/cm(2), open circuit voltage of 0.91 +/- 0.01 V, and fill factor of 0.56 +/- 0.01. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793195]