Photocatalysis: Fundamentals and Perspectives
CHAPTER 5: Photoexcitation in Pure and Modified Semiconductor Photocatalysts
Published:17 Mar 2016
Special Collection: 2016 ebook collection , ECCC Environmental eBooks 1968-2022Series: Energy and Environment
Gonu Kim, Yiseul Park, Gun-hee Moon, Wonyong Choi, 2016. "Photoexcitation in Pure and Modified Semiconductor Photocatalysts", Photocatalysis: Fundamentals and Perspectives, Jenny Schneider, Detlef Bahnemann, Jinhua Ye, Gianluca Li Puma, Dionysios D Dionysiou, Jenny Schneider, Detlef Bahnemann, Jinhua Ye, Gianluca Li Puma, Dionysios D Dionysiou
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Semiconductor photocatalysis has great promise for applications in solar energy conversion and environmental remediation because it is inexpensive, versatile, and environmentally benign. However, some critical factors such as limited light absorption and fast electron–hole pair recombination restrict the practical applications. Because no pure-phase semiconductors efficiently utilize solar irradiation, semiconductor materials have been modified in various ways to enhance their light-absorption properties. In this chapter, photoexcitation in modified semiconductor systems that include the impurity-doped, coupled, dye-sensitized, ligand-to-metal charge transfer (LMCT)-sensitized, and local surface plasmon resonance (LSPR)-sensitized semiconductors are discussed. In particular, the photoexcitation mechanism, charge transfer pathway, applications, and limitations of each method are described.