Solution-processed p-i-n organic solar cells using a photoprecursor method

Ken-ichi Nakayama^a^,^c, Yuji Yamaguchi^a^,^c, Hiroko Yamada^b^,^c, Mitsuharu Suzuki^b^,^c

^aYamagata University, Jonan4-3-16, Yonezawa, 992, Japan

^bNara Institute of Science and Technology - Japan, 8916-5 Takayama-cho, Ikoma, 630-0192, Japan

^cCREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Ken-ichi Nakayama, 099
Publication date: 5th February 2015

In the bulk-heterojunction (BHJ) organic solar cells, the single active layer must be equipped with many functions, i.e., photoabsorption, photogeneration, and photocarrier collection. The layered structure enables us to design and tune each layer separately. Generally, it is difficult to prepare a multilayer structure by solution process because the underlayer tends to be dissolved. The diketone compound is photoconvertible material that can be converted from soluble precursor to insoluble acene molecule upon photoirradiation. Repeating spin-coating and subsequent photoirradiation realizes solution-processed multilayer devices. DTADK includes an anthracene diketone core, indicating high semiconducting performance. EH-DBTA has extended p–conjugation system with thiophene units. The i–layer similar to BHJ layer was prepared from mixed solution of donor (diketone molecules) and acceptor (PC71BM). We fabricated homo p–i–n devices (DTADK for both p and i layer), and hetero p–i–n devices (DTADK for p–layer and EH-DBTA for i-layer), and compared them to the BHJ devices. The BHJ device showed low performance with low J_SC and high series resistance. The homo p–i–n device showed improved FF and J_SC, indicating sandwiching the BHJ layer by the p and n layer is effective to redeem the low electric property of the BHJ layer. Furthermore, the hetero p–i–n device showed much higher J_SC, which is mainly attributed to the extended absorption spectrum of EH-DBTA. Thus, the layered structure enables us to employ different materials suitable for each layer. The layered structure in the solution-processed photovoltaic devices is expected as a promising way to break the limit of the BHJ-type solar cells.
Photoconversion reaction of the photoprecursor molecules.
Yamaguchi, Y.; Suzuki, M.; Motoyama, T.; Sugii, S.; Katagiri, C.; Takahira, K.; Ikeda, S.; Yamada, H.; Nakayama, K. Sci. Rep., 2014, DOI: 10.1038/srep07151.

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