Optical absorption of thin film on a Lambertian reflector substrate
- 1 May 1984
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electron Devices
- Vol. 31 (5) , 634-636
- https://doi.org/10.1109/T-ED.1984.21582
Abstract
A formula is derived for calculating the optical absorption of thin films deposited on a Lambertian reflector substrate. It is shown that compared with the case of flat reflecting substrate, the incoherent absorption is enhanced by a factor ofm\epsilon_{1}in the weak absorption limit, where ε1is the real part of the film dielectric constant andm \simeq 2is a slightly varying function of ε1. For a 0.5-µm a-SiHx(bandgap 1.7 eV) solar cell with a Lambertian reflector substrate, the total absorption in terms of the short-circuit current is calculated to be 18.63 mA/cm2.Keywords
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