User: Guest  Login
Title:

Admittance Spectroscopy on Irradiated GaAs Component Cells: Defect Analysis and Characterization

Document type:
Konferenzbeitrag
Contribution type:
Textbeitrag / Aufsatz
Author(s):
Pellegrino, C.; Gagliardi, A.; Zimmermann, C.G.
Abstract:
Temperature-dependent admittance spectroscopy is shown to be a valuable method to perform defect characterization in standardized 2 cm × 2 cm component cells, representative of the individual sub-cells in the triple-junction architecture GaInP/GaAs/Ge. The admittance spectra of the GaAs subcell irradiated with protons and electrons is analyzed in the range 90 K < T < 300 K. The signature of the irradiation-induced defect H1 is detected, located 0.29 eV above the valence band. An admittance model including the effect of a Gaussian-like distribution of defects in the band gap is adopted to fit the experimental data and to extract the electrical parameters of H1. Moreover, the signature of a second thermally-activated process is detected and ascribed to majority carrier transport over the barrier formed at the back-surface field region of the cell. A simple multi-conductance model is used to fit the measured admittance data and to extract the barrier height.
Keywords:
admittance spectroscopy , GaAs solar cell , displacement damage dose , irradiation-induced defect , hetero-barrier
Book / Congress title:
47th IEEE Photovoltaic Specialists Conference (PVSC)
Congress (additional information):
Calgary OR Canada, 15-21 June 2020-06
Publisher:
IEEE Digital Explorer
Year:
2020
Quarter:
2. Quartal
Year / month:
2020-06
Month:
Jun
Pages:
0156-0159
Print-ISBN:
978-1-7281-6116-7
E-ISBN:
978-1-7281-6115-0
Bookseries ISSN:
0160-8371
Language:
en
Fulltext / DOI:
doi:10.1109/PVSC45281.2020.9300890
WWW:
https://ieeexplore.ieee.org/abstract/document/9300890
 BibTeX