Question

Problem 4: Read Appendix 2 below (Sec. 1.4.1 of Kasap) and then solve. A metallic back contact is applied to the CdTe solar cell of Problem 1 using a set up similar to that described in Figure 1.74 (b) on the next page. To form the metallic back contact, two evaporation sources are used, Cu and Au. An initial 3 nm layer of Cu is deposited first and then 30 nm of Au is deposited. After these depositions, the sample is annealed at 150°C for about 45 min to diffuse the Cu into the CdTe; the Au layer remains intact at the back of the CdTe solar cell to serve as the final back contact. The following problem describes the deposition of Au onto a Si chip; however, the process is similar for depositing Cu/Au on the back of a CdTe solar cell

Answer 1

RI RT 8.31yve33-27) o lume f ossume that eark moleculc occupres a ubri space then Hence, tht mean. 8 aTahanú (9 欲.aqメ1o"구끼 (rmem fre.