Journal Article Fullerene-Based n-Type Materials That Can Be Processed by a Photoprecursor Approach for Photovoltaic Applications

Kawajiri, Kazuki  ,  Kawanoue, Takahiro  ,  Yamato, Masaki  ,  Terai, Kengo  ,  Yamashita, Masataka  ,  Furukawa, Mari  ,  Aratani, Naoki  ,  Suzuki, Mitsuharu  ,  Nakayama, Ken-ichi  ,  Yamada, Hiroko

2017-01-01 , ECS
The active layer of organic photovoltaic cells (OPVs) is typically a blend of p- and n-type semiconductors, and the arrangement of these materials largely affects the device performance. We have recently proposed a unique deposition technique in which α-diketone-type photoprecursors are solution-deposited and then subjected to in-situ photoreaction to form acene-based semiconductors, as an effective means for controlling the morphology and vertical composition profile in organic molecular blends. However, the applicability of this “photoprecursor approach” has been limited to p-type materials so far, restricting the flexibility in designing photovoltaic layers. Herein, we report α-diketone-type photoprecursors of two fullerene-anthracene conjugates which have been designed to serve as n-type material in OPVs. The new α-diketones, named N601DK and N602DK, are successfully applied to the photoprecursor approach, affording smooth thin films of the corresponding photoreaction products N601 and N602. The n-type materials thus produced are evaluated in bulk-heterojunction (BHJ) OPVs and found to show good photovoltaic response. Especially, N601 performs as well as PC61BM, a fullerene-based benchmark n-type material. These results will serve as a basis for further improvement of OPVs through optimization of the molecular arrangement in solution-processed photovoltaic layers.

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