Electroluminescence analysis of silicon interdigitated back contact solar cells with a front surface selective band offset barrier

Koffi Ahanogbe (1) , J Alvarez (1) , Alexandre Jaffré (1) , J.P. Connolly (1) , Marie-Estelle Gueunier-Farret (1) , Erwann Fourmond (2) , Seif El-Whibi (2) , Alain Fave (2) , Perrine Carroy (3) , Zakaria Djebbour (1) , Jean-Paul Kleider (1)

1 GeePs - Laboratoire Génie électrique et électronique de Paris
2 INL - I-Lum - INL - Ingénierie et conversion de lumière (i-Lum)
3 INES - Institut National de L'Energie Solaire

Electroluminescence allows rapid characterization of an entire photovoltaic solar cell and visualization of defects at the micrometer scale. Here we focus on the optoelectronic properties of silicon interdigitated back contact cells characterized by electroluminescence. The spatially resolved electroluminescence helps us control the quality of interdigitated back contact structures used in silicon bottom subcells in a three-terminal tandem perovskite on silicon solar cell. Local variations in minority carrier diffusion length, surface recombination velocity and, the impact of resistive and optical losses were analyzed by electroluminescence mapping. In addition, we quantify the radiative saturation current density and the radiative open circuit voltage using the electroluminescence spectrum of the cell. This step allows us to accurately assess the performance limits induced in the device due to the non-radiative recombination.

Keywords: Electroluminescence; characterization; three-terminal; tandem solar cell

Domains: Micro and nanotechnologies/Microelectronics; Electronics

Koffi Ahanogbe, J Alvarez, Alexandre Jaffré, J.P. Connolly, Marie-Estelle Gueunier-Farret, et al.. Electroluminescence analysis of silicon interdigitated back contact solar cells with a front surface selective band offset barrier. EPJ Photovoltaics, 2022, Recent Advances in Spectroscopy and Microscopy of Thin-films Materials, Interfaces, and Solar Cells 2021', 13, pp.16. ⟨10.1051/epjpv/2022015⟩. ⟨hal-03739827⟩