title: An insight into the mechanism of charge-transfer of hybrid polymer:ternary/quaternary chalcopyrite colloidal nanocrystals.
abstract: In this work, we have demonstrated the structural and optoelectronic properties of the surface of ternary/quaternary (CISe/CIGSe/CZTSe) chalcopyrite nanocrystallites passivated by tri-n-octylphosphine-oxide (TOPO) and tri-n-octylphosphine (TOP) and compared their charge transfer characteristics in the respective polymer: chalcopyrite nanocomposites by dispersing them in poly(3-hexylthiophene) polymer. It has been found that CZTSe nanocrystallites due to their high crystallinity and well-ordered 3-dimensional network in its pristine form exhibit a higher steric- and photo-stability, resistance against coagulation and homogeneity compared to the CISe and CIGSe counterparts. Moreover, CZTSe nanocrystallites display efficient photoluminescence quenching as evident from the high value of the Stern-Volmer quenching constant (K SV) and eventually higher charge transfer efficiency in their respective polymer P3HT:CZTSe composites. We modelled the dependency of the charge transfer from the donor and the charge separation mechanism across the donor-acceptor interface from the extent of crystallinity of the chalcopyrite semiconductors (CISe/CIGSe/CZTSe). Quaternary CZTSe chalcopyrites with their high crystallinity and controlled morphology in conjunction with regioregular P3HT polymer is an attractive candidate for hybrid solar cells applications.
authors.affiliation: CSIR-Network of Institutes for Solar Energy (NISE), National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India.
authors.forename: Parul
authors.initials: P
authors.lastname: Chawla
authors.affiliation: CSIR-Network of Institutes for Solar Energy (NISE), National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India.
authors.forename: Son
authors.initials: S
authors.lastname: Singh
authors.affiliation: CSIR-Network of Institutes for Solar Energy (NISE), National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India.
authors.forename: Shailesh Narain
authors.initials: SN
authors.lastname: Sharma
keywords: P3HT; chalcopyrites; charge-transfer; hybrid organic-inorganic; nanocomposites