Photoexcited carrier dynamics in organic solar cells

Soh Ryuzaki, Jun Onoe

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Understanding the photoexcited carrier dynamics in organic photovoltaic (OPV) cells helps us to improve their power conversion efficiency (η) for practical use because some breakthroughs in the recent decade have been based on bulk-heterojunctions (BHJs) between donor (D) and acceptor (A) materials. The BHJ plays a role of increasing the D-A interface area involving photocarrier generation regions, and thus the number of photocarriers increases at the interfaces [1,2]. Although the BHJ can improve the η of OPV cells by up to ca. 8%, the improving rate of η does not significantly increase [3-5]. This is presumably because there are still major unclear points for BHJ as follows: (1) the nanostructure of the BHJ schematic illustration has been shown) and (2) the reproducibility of BHJ fabrication. Figure 6.1 schematically illustrates typical structures of (a) a D-A hetero doublelayered OPV cell and (b) a BHJ-OPV cell. As shown in Figure 6.1b, because the BHJ is fabricated by coevaporation of donor and acceptor materials or by spin-coating conductive polymers, the D-A interface thus formed is too complex to analyze and reproduce the nanostructure compared to that of a double-layered heterojunction [2,6]. These facts make it difficult to discuss the photoexcited carrier dynamics at the BHJ D-A interface. Accordingly, the reason why the BHJ improves the η has been unclear so far.

Original languageEnglish
Title of host publicationOrganic Solar Cells
Subtitle of host publicationMaterials, Devices, Interfaces, and Modeling
PublisherCRC Press
Pages143-166
Number of pages24
ISBN (Electronic)9781482229844
ISBN (Print)9781482229837
DOIs
Publication statusPublished - Jan 1 2017

Fingerprint

Heterojunctions
heterojunctions
solar cells
Photovoltaic cells
photovoltaic cells
Nanostructures
Organic solar cells
acceptor materials
donor materials
circuit diagrams
Schematic diagrams
Spin coating
Conversion efficiency
coating
Fabrication
fabrication
polymers
Polymers

All Science Journal Classification (ASJC) codes

  • Energy(all)
  • Physics and Astronomy(all)
  • Engineering(all)

Cite this

Ryuzaki, S., & Onoe, J. (2017). Photoexcited carrier dynamics in organic solar cells. In Organic Solar Cells: Materials, Devices, Interfaces, and Modeling (pp. 143-166). CRC Press. https://doi.org/10.1201/b18072

Photoexcited carrier dynamics in organic solar cells. / Ryuzaki, Soh; Onoe, Jun.

Organic Solar Cells: Materials, Devices, Interfaces, and Modeling. CRC Press, 2017. p. 143-166.

Research output: Chapter in Book/Report/Conference proceedingChapter

Ryuzaki, S & Onoe, J 2017, Photoexcited carrier dynamics in organic solar cells. in Organic Solar Cells: Materials, Devices, Interfaces, and Modeling. CRC Press, pp. 143-166. https://doi.org/10.1201/b18072
Ryuzaki S, Onoe J. Photoexcited carrier dynamics in organic solar cells. In Organic Solar Cells: Materials, Devices, Interfaces, and Modeling. CRC Press. 2017. p. 143-166 https://doi.org/10.1201/b18072
Ryuzaki, Soh ; Onoe, Jun. / Photoexcited carrier dynamics in organic solar cells. Organic Solar Cells: Materials, Devices, Interfaces, and Modeling. CRC Press, 2017. pp. 143-166
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