Abstract
The 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.
Lingua originale | English |
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pagine (da-a) | 3416-3424 |
Numero di pagine | 9 |
Rivista | Nano Research |
Volume | 13 |
Stato di pubblicazione | Published - 2020 |
All Science Journal Classification (ASJC) codes
- ???subjectarea.asjc.2500.2500???
- ???subjectarea.asjc.2200.2208???
- ???subjectarea.asjc.3100.3107???
- ???subjectarea.asjc.3100.3104???