CIGS solar cell technology is an alternate to silicon (Si) solar cell technology and module efficiency is comparable. There are several significant benefits in using CIGS technology..
For CIGS solar cells fabrication two types of device structures are used, (i) substrate structure, and (ii) superstrate structure. In the former, opaque substrates are used and, in the latter, a transparent glass substrate is used, and light enters through glass.
Schematic cross-section of CIGS solar cells having substrate structure. Heterojunction is formed at the p-type CIGS/n-type CdS interface. Top and bottom contacts are Al/Ni and molybdenum respectively. A high resistive intrinsic ZnO layer is used to prevent shunting path due to diffusion of aluminum into the absorber from Al-doped ZnO layer. For lateral conduction of photogenerated electrons to Ni/Al grids, a low resistive Al-doped ZnO is used.
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