Santanu Bag - Yorktown Heights NY, US David Aaron Randolph Barkhouse - New York NY, US David Brian Mitzi - Mahopac NY, US Teodor Krassimirov Todorov - Yorktown Heights NY, US
Assignee:
International Business Machines Corporation - Armonk NY
Techniques for fabrication of kesterite Cu—Zn—Sn—(Se,S) films and improved photovoltaic devices based on these films are provided. In one aspect, a method of fabricating a kesterite film having a formula CuZnSn(SSe), wherein 0≦x≦1; 0≦y≦1; 0≦z≦1; and −1≦q≦1 is provided. The method includes the following steps. A substrate is provided. A bulk precursor layer is formed on the substrate, the bulk precursor layer comprising Cu, Zn, Sn and at least one of S and Se. A capping layer is formed on the bulk precursor layer, the capping layer comprising at least one of Sn, S and Se. The bulk precursor layer and the capping layer are annealed under conditions sufficient to produce the kesterite film having values of x, y, z and q for any given part of the film that deviate from average values of x, y, z and q throughout the film by less than 20 percent.
Johnston-Willis Medical Center Radiation Oncology 1401 Johnston Willis Dr, Richmond, VA 23235 (804)3302164 (phone), (804)3302325 (fax)
Education:
Medical School Eastern Virginia Medical School Medical College Graduated: 1983
Languages:
English
Description:
Dr. Randolph graduated from the Eastern Virginia Medical School Medical College in 1983. He works in Richmond, VA and specializes in Radiation Oncology. Dr. Randolph is affiliated with Johnston-Willis Hospital.