Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 11, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201700107
Keywords
charge transfer; dopant-free; heterocontact; inversion layer; MoOx
Funding
- National Key Research and Development Program of China [2016YFA0202402]
- National Natural Science Foundation of China [91123005, 61674108]
- Jiangsu Key Laboratory for Carbon-Based Functional Materials Devices
- NSFC Research Fund for International Young Scientists [11550110176]
- Priority Academic Program Development of Jiangsu Higher Education Institution
- 111 Projects
- Collaborative Innovation Center of Suzhou Nano Science and Technology
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solar cells are currently under intensive investigation due to their simple fabrication process and less parasitic light absorption compared to traditional heterocontact counterparts. Effective segregation of carriers which is related to carrier-selective heterocontact is crucial for the performance of photovoltaic devices. Molybdenum oxide (MoOx, x <= 3), with a wide bandgap of similar to 3.24 eV as well as defect bands derived from oxygen vacancies located inside the band gap, has been introduced to integrate with n-type Si (n-Si) as hole selective contact. Here, we utilize a stepwise in situ deposition of MoOx to investigate its interaction with Si by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) measurements. A strong inversion layer originating from a charge transfer process is demonstrated in the n-Si surface region upon MoOx contact characterized by XPS, UPS, capacitance-voltage (C-V), and minority charge carrier lifetime mapping measurements. [GRAPHICS] A dopant-free heterocontact is built within n-Si with a high built-in potential (V-bi) of similar to 0.80V which benefits for acquiring a high open circuit voltage (V-oc). These results give a detailed interpretation on the carrier transport mechanism of MoOx/n-Si heterocontact and also pave a new route toward fabricating high efficiency, low-cost solar cells. (C) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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