Numerical Simulations of Time-Resolved Photoluminescence in CdSexTe1-x/CdTe Solar Cells

Conference · Tue Jan 05 04:00:00 EST 2021

DOI:https://doi.org/10.1109/PVSC45281.2020.9300736· OSTI ID:1827901

Moseley, John; Krasikov, Dmitry; Kuciauskas, Darius

We present initial time-resolved photoluminescence (TRPL) simulations in graded CdSexTe1-e thin-film solar cells to quantify the front-interface recombination velocity, S int,front . Our model includes several composition dependences: bandgap energy, absorption coefficient, electron affinity, and carrier lifetime. Cathodoluminescence spectrum imaging measurements on bevels provide an estimate of the bandgap and the CdSe x Te 1-x alloy composition through the absorber thickness. TRPL decays are simulated as a function of the laser power, S int,front , front-interface band offset, and bulk Shockley-Read-Hall lifetime. We find the impact of S intf,ront on the PL decay increases as the band offset shifts from a "spike" to a "cliff". Recombination rate analysis shows that back-interface recombination could potentially dictate the later part of the TRPL decay "t 2" in high-lifetime CdSe x Te 1-x cells. We briefly discuss ongoing work to determine TRPL measurement conditions that maximize sensitivity to S itnt,front.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1827901
• Report Number(s): NREL/CP-5K00-75931; MainId:6627; UUID:965c00e9-ea3e-ea11-9c2f-ac162d87dfe5; MainAdminID:63242
• Country of Publication: United States
• Language: English

Related Subjects

CdTe solar cells
SOLAR ENERGY
interface recombination
time-resolved photoluminescence