Photonics of fullerene-conducting polymer composites and multilayered structures: new results and prospects

Katsumi Yoshino; Kenji Yoshimoto; Kazuya Tada; Hishashi Araki; Tsuyoshi Kawai; Masanori Ozaki; Anvar A. Zakhidov

doi:10.1117/12.228125

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8 December 1995 Photonics of fullerene-conducting polymer composites and multilayered structures: new results and prospects

Katsumi Yoshino, Kenji Yoshimoto, Kazuya Tada, Hishashi Araki, Tsuyoshi Kawai, Masanori Ozaki, Anvar A. Zakhidov

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Proceedings Volume 2530, Fullerenes and Photonics II; (1995) https://doi.org/10.1117/12.228125
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The general features of charge transfer processes fullerene/conducting polymer (CP) systems, such as energetics of photoinduced charge transfer (PCT) between C₆₀ and CP (pi) - electronic states, geometry of (pi) -(pi) overlapping and the role of self-trapping effects to polaronic states on C₆₀ and CP chains on the PCT dynamics are analyzed. Persistent photoconductivity and electroluminescence quenching recently found in C₆₀/CP composites additionally to photoconductivity enhancement and photoluminescence quenching observed earlier, indicate that photogenerated C₆₀ radicals may be extremely long living in CP matrices, due to multicharging of C₆₀ as suggested by us accompanied with deep self-trapping to polaron/bipolaron states. The anisotropy of PCT is proposed to arise due to orientational modulation of overlapping between polaronic rings on C₆₀ and CP which strongly suppresses back recombination. The strategy to increase the efficiency of C₆₀CP donor-acceptor (DA) photocells by improving PCT is analyzed, particularly considering multilayered structures with polarization barriers at interfaces, and increased intralayer mobilities of carriers. To increase the efficiency of photons collection in photocells we suggest three layered D-M-A structures, with molecular 'photon pump' layers strongly absorbing photons. The prospects for novel photonic applications of various C₆₀CP systems, such as NLO devices and photomodulated field effect transistors (FETs) are discussed and illustrated by the newest results. New results on superconductivity of C₆₀/CP upon alkali metal doping are presented, and exciting possibilities for novel superconducting phases in this system are discussed.

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Katsumi Yoshino, Kenji Yoshimoto, Kazuya Tada, Hishashi Araki, Tsuyoshi Kawai, Masanori Ozaki, and Anvar A. Zakhidov "Photonics of fullerene-conducting polymer composites and multilayered structures: new results and prospects", Proc. SPIE 2530, Fullerenes and Photonics II, (8 December 1995); https://doi.org/10.1117/12.228125

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