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Small molecular organic photovoltaic cells with exciton blocking layer at anode interface for improved device performance

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2 Author(s)
Hirade, Masaya ; Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan ; Adachi, Chihaya

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We demonstrate enhanced power conversion efficiency (ηPCE) for small molecular-based organic photovoltaic cells with an exciton blocking layer (ExBL) at the anode/donor interface. Although poly(3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS) films are widely used as anodic buffer layers, they also act as exciton quenchers. To prevent exciton quenching, we introduced a tris[4-(5-phenyl thiophen-2-yl)phenyl]amine layer between the donor and the PEDOT:PSS layer and clarified its effect. By a combination of dual ExBLs at both the anode and cathode sides, we achieved significantly enhanced short circuit current and ηPCE values; the highest ηPCE = 5.24% was obtained by optimizing the device parameters.

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Applied Physics Letters  (Volume:99 ,  Issue: 15 )