Transmission Electron Microscopy And Electron Energy-Loss Spectroscopy Studies Of Hole-Selective Molybdenum Oxide Contacts In Silicon Solar Cells
Keywords
electron energy-loss spectroscopy (EELS); hole-selective; molybdenum oxide (MoO ) x; silicon; transmission electron microscopy (TEM)
Abstract
In this study, substochiometric hole-selective molybdenum oxide (MoOx) contacts in crystalline silicon (c-Si) solar cells were investigated by a combination of transmission electron microscopy (TEM) and spatially resolved electron energy-loss spectroscopy (SR-EELS). It was observed that a ≈ 4 nm SiOx interlayer grows at the MoOx/c-Si interface during the evaporation of MoOx over a c-Si substrate. SR-EELS analyses revealed the presence of a 1.5 nm diffused MoOx/indium tin oxide (ITO) interface in both as-deposited and annealed samples. Moreover, the presence of a 1 nm thin layer with a lower oxidation state of Mo was detected at the SiOx/MoOx interface in an as-deposited state, which disappears upon annealing. Overall, it was evident that no hole-blocking interlayer is formed at the MoOx/ITO interface during annealing and homogenization of the MoOx layer takes place during the annealing process. Furthermore, device simulations revealed that efficient hole collection is dependent on MoOx work function and that reduction in the work function of MoOx results in loss of band bending and negatively impacts hole selectivity.
Publication Date
11-20-2019
Publication Title
ACS Applied Materials and Interfaces
Volume
11
Number of Pages
43075-43080
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1021/acsami.9b12703
Copyright Status
Unknown
Socpus ID
85074917561 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/85074917561
STARS Citation
Ali, Haider; Maynau, Céline; Lajaunie, Luc; Gregory, Geoffrey; and Wu, Lijun, "Transmission Electron Microscopy And Electron Energy-Loss Spectroscopy Studies Of Hole-Selective Molybdenum Oxide Contacts In Silicon Solar Cells" (2019). Scopus Export 2015-2019. 10631.
https://stars.library.ucf.edu/scopus2015/10631