Noncovalent Liquid Phase Functionalization of 2H-WS₂ with PDI: An Energy Conversion Platform with Long-Lived Charge Separation

Abstract

Transition metal dichalcogenides are attractive 2D materials in the context of solar energy conversion. Previous investigations have focused predominantly on the properties of these systems. The realization of noncovalent hybrids with, for example, complementary electroactive materials remains underexplored to this date for exfoliated WS 2 . In this contribution, we explore WS 2 by means of exfoliation and integration together with visible light-absorbing and electron-accepting perylene diimides into versatile electron-donor acceptor hybrids. Important is the distinct electron-donating feature of WS 2 . Detailed spectroscopic investigations of WS 2 −PDI confirm the electron donor/acceptor nature of the hybrid and indicate that green light photoexcitation leads to the formation of long-lived WS 2•+ −PDI •− charge-separated states.

Transition Metal Dichalcogenides Interfacing Photoactive Molecular Components for Managing Energy Conversion Processes

“…In more detail, noncovalent liquid‐phase functionalization of 2H‐WS 2 allows to bind via σ (WS 2 )– π –stacking interactions with PDI derivatives. [ 121 ] Detailed spectroscopic investigations of WS 2 /PDI confirmed the electron‐donating feature of WS 2 , along with the electron acceptor properties of PDI. In the ground state, a charge transfer band is observed, which is 29 nm redshifted compared with the absorption of the PDI reference.…”

Advancements in transition metal dichalcogenides (TMDCs) for self-powered photodetectors: challenges, properties, and functionalization strategies

“…Tobias Scharl et al investigated WS 2 through exfoliation and combined it with perylene diamides (C 36 H 29 NO), which absorb visible light and accept electrons, creating adaptable electron-donor acceptor hybrids. 192 Following the discovery of graphene, a variety of TMDCs have surfaced, showcasing remarkable performance utilized in photodetectors. However, despite their potential, TMDCs based photodetectors encounter numerous challenges.…”

Functionalized 2D transition metal dichalcogenide inks via liquid‐phase exfoliation for practical applications

“…[76][77][78][79] Furthermore, the functionalization of TMDs through non-covalent or covalent methods with the use of additives ensures the preservation of pristine semiconductor properties. This, in turn, enhances their versatility for practical applications as shown in Figure 3c-e. [76][77][78][79][80][81][82][83][84] In the following section, we introduce three representative LPE-based techniques. (Figure 4).…”