| Autor: |
Du, Rui, Takenaka, Haruki, Sato, Takumi, Koda, Yoichiro, Mesuda, Masami, Toko, Kaoru, Suemasu, Takashi |
| Zdroj: |
ACS Applied Materials & Interfaces; October 2024, Vol. 16 Issue: 39 p52595-52603, 9p |
| Abstrakt: |
Barium disilicide (BaSi2) is a thin-film solar cell material composed of abundant elements, and its application potential is further enhanced by its formation on inexpensive substrates, such as glass. The effect of the substrate temperature on the co-sputtering of BaSi2and Ba targets to form BaSi2films on Si(111) and TiN/glass substrates was investigated. Contrary to expectations, the photoresponsivity reached maximum values exceeding 5 and 2 A W–1, respectively, the highest value ever reported for as-deposited samples formed at 750 °C, more than 100 °C higher than those reported previously. Because the photoresponsivity is proportional to carrier lifetime, this result indicates that high-temperature growth can bring out the high performance of BaSi2as a light-absorbing layer. Because amorphous SiC (a-SiC) has a larger forbidden band gap and electron affinity than BaSi2, it is considered suitable as an electron transport layer (ETL) material for BaSi2solar cells. On the basis of this, the formation of BaSi2(absorption layer)/a-SiC (ETL)/TiN (electrode)/glass heterojunctions was also attempted, and the layered structure was examined by cross-sectional transmission electron microscopy (TEM). Polycrystalline BaSi2films were found to be even on the amorphous layer by TEM. A high photoresponsivity of over 2 A W–1was obtained. Therefore, the BaSi2/a-SiC/TiN structure provides a guideline for the structural design of BaSi2-based thin-film solar cells on glass. |
| Databáze: |
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