Strong 1D localization and highly anisotropic electron–hole masses in heavy-halogen functionalized graphenes. Issue 36 (5th September 2016)

• Record Type: Journal Article
• Authors: Marsoner Steinkasserer, Lukas Eugen; Zarantonello, Alessandra; Paulus, Beate
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 36(2016)
• Page Start: 25629
• Page End: 25636
• Publication Date: 2016-09-05
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp05188j
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Heavy halogen functionalization of fluorographene produces systems displaying highly anisotropic charge carrier masses and optical gaps attractive for solar cell applications. Abstract : While halogenation of graphene presents a fascinating avenue to the construction of a chemically and physically diverse class of systems, their application in photovoltaics has been hindered by often prohibitively large optical gaps. Herein we study the effects of partial bromination and chlorination on the structure and optoelectronic properties of both graphane and fluorographene. We find brominated and chlorinated fluorographene derivatives to be as stable as graphane with a detailed investigation of the systems band structure revealing significant 1D localization of the charge carriers as well as strongly electron–hole asymmetric effective masses. Lastly using G 0 W 0 and BSE, we investigate the optical adsorption spectra of the aforementioned materials whose first adsorption peak is shown to lie close to the optimal peak position for photovoltaic applications (≈1.5 eV).