期刊
APPLIED SCIENCES-BASEL
卷 5, 期 4, 页码 695-705出版社
MDPI
DOI: 10.3390/app5040695
关键词
transition metal oxides; silicon heterojunction solar cells; vanadium oxide; molybdenum oxide; tungsten oxide; rhenium oxide
类别
资金
- Spain government [ENE2013-48629-C4-1-R, ENE2014-56237-C4-1-R]
- Mexican government grants program (CONACyT)
- Erasmus Mundus Action 2 Areas+ grants program
During the last decade, transition metal oxides have been actively investigated as hole-and electron-selective materials in organic electronics due to their low-cost processing. In this study, four transition metal oxides (V2O5, MoO3, WO3, and ReO3) with high work functions (>5 eV) were thermally evaporated as front p-type contacts in planar n-type crystalline silicon heterojunction solar cells. The concentration of oxygen vacancies in MoO3-x was found to be dependent on film thickness and redox conditions, as determined by X-ray Photoelectron Spectroscopy. Transfer length method measurements of oxide films deposited on glass yielded high sheet resistances (similar to 10(9) Omega/sq), although lower values (similar to 104 Omega/sq) were measured for oxides deposited on silicon, indicating the presence of an inversion (hole rich) layer. Of the four oxide/silicon solar cells, ReO3 was found to be unstable upon air exposure, while V2O5 achieved the highest open-circuit voltage (593 mV) and conversion efficiency (12.7%), followed by MoO3 (581 mV, 12.6%) and WO3 (570 mV, 11.8%). A short-circuit current gain of similar to 0.5 mA/cm(2) was obtained when compared to a reference amorphous silicon contact, as expected from a wider energy bandgap. Overall, these results support the viability of a simplified solar cell design, processed at low temperature and without dopants.
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