High-Efficiency Triple-Layer Amorphous Solar Cell for Space Applications
The high-efficiency triple-layer amorphous solar cell, as illustrated in Figure 6.8, consists of three semiconductor layers stacked one over the other and each semiconductor layer is optimized for maximum absorption of the incident solar energy in three distinct spectral regions of the solar spectrum, leading to higher overall conversion efficiency of the cell. The black reflector layer further reduces the reflection
losses. The transparent conductive oxide film provides protection to the solar cells from dust, rain, and wind. A radiation shield can be installed over the solar array to minimize the damage to the solar cells from low-energy electron and high-energy proton radiation effects. However, this will increase the weight, size, and cost of the solar array. Projected conversion efficiencies for this type of solar cell vary from 21 to 25 percent under laboratory environments. Cost and reliability data are not readily available.