Photovoltaic Properties in Interpenetrating Heterojunction Organic Solar Cells Utilizing MoO₃ and ZnO Charge Transport Buffer Layers

Tetsuro Hori; Hiroki Moritou; Naoki Fukuoka; Junki Sakamoto; Akihiko Fujii; Masanori Ozaki

doi:10.3390/ma3114915

Photovoltaic Properties in Interpenetrating Heterojunction Organic Solar Cells Utilizing MoO₃ and ZnO Charge Transport Buffer Layers

Materials (Basel). 2010 Nov 8;3(11):4915-4921. doi: 10.3390/ma3114915.

Authors

Tetsuro Hori¹, Hiroki Moritou¹, Naoki Fukuoka¹, Junki Sakamoto¹, Akihiko Fujii², Masanori Ozaki¹

Affiliations

¹ Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
² Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan. afujii@opal.eei.eng.osaka-u.ac.jp.

Abstract

Organic thin-film solar cells with a conducting polymer (CP)/fullerene (C₆₀) interpenetrating heterojunction structure, fabricated by spin-coating a CP onto a C₆₀ deposit thin film, have been investigated and demonstrated to have high efficiency. The photovoltaic properties of solar cells with a structure of indium-tin-oxide/C₆₀/ poly(3-hexylthiophene) (PAT6)/Au have been improved by the insertion of molybdenum trioxide (VI) (MoO₃) and zinc oxide charge transport buffer layers. The enhanced photovoltaic properties have been discussed, taking into consideration the ground-state charge transfer between PAT6 and MoO₃ by measurement of the differential absorption spectra and the suppressed contact resistance at the interface between the organic and buffer layers.

Keywords: buffer layers; interpenetrating heterojunction; molybdenum trioxide; organic solar cells; zinc oxide.