Kejia Wang, Oki Gunawan, et al.
Optics Express
We demonstrate that a fundamental performance bottleneck for hydrazine processed kesterite Cu2ZnSn(S,Se)4 (CZTSSe) solar cells with efficiencies reaching above 11% can be the formation of band-edge tail states, which quantum efficiency and photoluminescence data indicate is roughly twice as severe as in higher-performing Cu(In,Ga)(S,Se)2 devices. Low temperature time-resolved photoluminescence data suggest that the enhanced tailing arises primarily from electrostatic potential fluctuations induced by strong compensation and facilitated by a lower CZTSSe dielectric constant. We discuss the implications of the band tails for the voltage deficit in these devices. © 2013 AIP Publishing LLC.
Kejia Wang, Oki Gunawan, et al.
Optics Express
Tayfun Gokmen
Frontiers in Artificial Intelligence
Teodor K. Todorov, Jiang Tang, et al.
Advanced Energy Materials
Teodor K. Todorov, Oki Gunawan, et al.
MSDE