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Interfacial Charge-Transfer Transitions for Direct Charge-Separation Photovoltaics

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  • Jun-ichi Fujisawa

    (Graduate School of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan)

Abstract

Photoinduced charge separation (PCS) plays an essential role in various solar energy conversions such as photovoltaic conversion in solar cells. Usually, PCS in solar cells occurs stepwise via solar energy absorption by light absorbers (dyes, inorganic semiconductors, etc.) and the subsequent charge transfer at heterogeneous interfaces. Unfortunately, this two-step PCS occurs with a relatively large amount of the energy loss (at least ca. 0.3 eV). Hence, the exploration of a new PCS mechanism to minimize the energy loss is a high-priority subject to realize efficient solar energy conversion. Interfacial charge-transfer transitions (ICTTs) enable direct PCS at heterogeneous interfaces without energy loss, in principle. Recently, several progresses have been reported for ICTT at organic-inorganic semiconductor interfaces by our group. First of all, new organic-metal oxide complexes have been developed with various organic and metal-oxide semiconductors for ICTT. Through the vigorous material development and fundamental research of ICTT, we successfully demonstrated efficient photovoltaic conversion due to ICTT for the first time. In addition, we revealed that the efficient photoelectric conversion results from the suppression of charge recombination, providing a theoretical guiding principle to control the charge recombination rate in the ICTT system. These results open up a way to the development of ICTT-based photovoltaic cells. Moreover, we showed the important role of ICTT in the reported efficient dye-sensitized solar cells (DSSCs) with carboxy-anchor dyes, particularly, in the solar energy absorption in the near IR region. This result indicates that the combination of dye sensitization and ICTT would lead to the further enhancement of the power conversion efficiency of DSSC. In this feature article, we review the recent progresses of ICTT and its application in solar cells.

Suggested Citation

  • Jun-ichi Fujisawa, 2020. "Interfacial Charge-Transfer Transitions for Direct Charge-Separation Photovoltaics," Energies, MDPI, vol. 13(10), pages 1-14, May.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:10:p:2521-:d:358850
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    References listed on IDEAS

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    1. Yiming Cao & Yasemin Saygili & Amita Ummadisingu & Joël Teuscher & Jingshan Luo & Norman Pellet & Fabrizio Giordano & Shaik Mohammed Zakeeruddin & Jacques -E. Moser & Marina Freitag & Anders Hagfeldt , 2017. "11% efficiency solid-state dye-sensitized solar cells with copper(II/I) hole transport materials," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
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    Cited by:

    1. Adam Glinka & Jacek Kubicki & Marcin Ziółek, 2021. "Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC," Energies, MDPI, vol. 14(2), pages 1-15, January.

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