Effects of Different Fluorine Dopants on the Properties of the Tin Oxide Window Layer and CdTe/CdS Solar Cell
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1012-Y02-04
Effects of Different Fluorine Dopants on the Properties of the Tin Oxide Window Layer and CdTe/CdS Solar Cell Xiaonan Li1, Mailasu Bai2, Joel Pankow1, Sally E. Asher1, Helio Moutinho R. Moutinho1, and Tim Gessert1 1 5200, National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO, 80401 2 Colorado School of Mines, 1500 Illinois Street, Golden, CO, 80401 ABSTRACT Conductive tin-oxide (SnO2) film is doped by group V or VII elements. Of all possible dopants, fluorine provides n-type SnO2 with the best electronic and optical properties. However, the commonly used fluorine dopant, bromotrifluoromethane (CBrF3), is a greenhouse gas. Thus, an alternative fluorine source is needed. In this work, we compared CIF3 as a fluorine dopant to CBrF3. With CBrF3 dopant, optimized carrier concentration and electron mobility values can reach to mid 1020 cm-3 and over 40 cm2/V-s, respectively. After carrier concentration saturates, the electronic mobility continues to improve with an increase of CBrF3 dopant concentration. As a comparison, to achieve similar carrier concentration, far less CIF3 dopant is required. However, the electron mobility is lower (
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