Optoelectronic Modeling of Graded-Bandgap Thin-Film Solar Cells

F. Ahmad, A. Lakhtakia, P. B. Monk, B. J. Civiletti

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Thin-film solar cells are cheap and easy to manufacture but require improvements as their efficiencies are low compared to that of the commercially dominant crystalline-silicon solar cells. A coupled optoelectronic model was formulated and implemented along with the differential evolution algorithm to assess the efficacy of grading the bandgap of the absorber layer in three thin-film solar cells. Optimal grading was predicted to yield efficiency of 21.1% with a 2200-nm-thick CIGS absorber layer for the CIGS solar cell, 21.14% with a 870-nm-Thick CZTSSe layer for the CZTSSe solar cell, and 34.5% with a 2000-nm-Thick AlGaAs layer for the AlGaAs solar cell. For a solar cell with two bandgap-graded absorber layers, an efficiency of 34.45% was predicted with a 300-nm-Thick CIGS layer and a 870-nm-Thick CZTSSe layer. For colored solar cells, efficiency loss was predicted from 10% to 20%, depending upon the percentage of incoming solar photons rejected.

Original languageEnglish (US)
Title of host publication2021 IEEE 32nd International Conference on Microelectronics, MIEL 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)9781665445283
StatePublished - Sep 12 2021
Event32nd IEEE International Conference on Microelectronics, MIEL 2021 - Nis, Serbia
Duration: Sep 12 2021Sep 14 2021

Publication series

NameProceedings of the International Conference on Microelectronics, ICM


Conference32nd IEEE International Conference on Microelectronics, MIEL 2021

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


Dive into the research topics of 'Optoelectronic Modeling of Graded-Bandgap Thin-Film Solar Cells'. Together they form a unique fingerprint.

Cite this