Experimental and Theoretical Study into Interface Structure and Band Alignment of the Cu<sub>2</sub>Zn<sub>1–<i>x</i></sub>Cd<sub><i>x</i></sub>SnS<sub>4</sub> Heterointerface for Photovoltaic Applications
Sachin R. Rondiya, Yogesh Jadhav, Nelson Y. Dzade, Raihan Ahammed, Tanmay Goswami, Abir De Sarkar, Sandesh Jadkar, Santosh K. Haram, Hirendra N. Ghosh
Abstract
(CCTS) nanocrystals compared to that of CZTS. We found that there exists a type-II staggered band alignment at the CZTS (CCTS)/CdS interface, from cyclic voltammetric (CV) measurements, corroborated by first-principles density functional theory (DFT) calculations, predicting smaller conduction band offset (CBO) at the CCTS/CdS interface as compared to the CZTS/CdS interface. These results point toward efficient separation of photoexcited carriers across the p-n junction in the ultrafast time scale and highlight a route to improve device performances.
Topics & Concepts
CZTSKesteriteMaterials scienceBand gapBand offsetOptoelectronicsCharge carrierNanocrystalSolar cellDirect and indirect band gapsNanotechnologyValence bandChalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And PropertiesCopper-based nanomaterials and applications