6533b873fe1ef96bd12d4c94
RESEARCH PRODUCT
Sub-gap defect density characterization of molybdenum oxide: An annealing study for solar cell applications
Miro ZemanOlindo IsabellaIsodiana CrupiPaul ProcelAntonino GulinoD. ScireD. Sciresubject
Materials scienceAnnealing (metallurgy)Oxide02 engineering and technologyPolaronSettore ING-INF/01 - Elettronica01 natural scienceslaw.inventionmolybdenum oxidechemistry.chemical_compoundlaw0103 physical sciencesThermalSolar cellGeneral Materials Sciencepolaron theoryElectrical and Electronic Engineering010302 applied physicsbusiness.industrysilicon heterojunction solar cellHeterojunction021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and Opticschemistrymolybdenum oxide density of states polaron theory silicon heterojunction solar celldensity of statesDensity of statesOptoelectronicsDensity functional theory0210 nano-technologybusinessdescription
AbstractThe application of molybdenum oxide in the photovoltaic field is gaining traction as this material can be deployed in doping-free heterojunction solar cells in the role of hole selective contact. For modeling-based optimization of such contact, knowledge of the molybdenum oxide defect density of states (DOS) is crucial. In this paper, we report a method to extract the defect density through nondestructive optical measures, including the contribution given by small polaron optical transitions. The presence of defects related to oxygen-vacancy and of polaron is supported by the results of our opto-electrical characterizations along with the evaluation of previous observations. As part of the study, molybdenum oxide samples have been evaluated after post-deposition thermal treatments. Quantitative results are in agreement with the result of density functional theory showing the presence of a defect band fixed at 1.1 eV below the conduction band edge of the oxide. Moreover, the distribution of defects is affected by post-deposition treatment.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-09-02 |