SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 4: Perovskite and photovoltaics I (joint session HL/CPP)
HL 4.11: Vortrag
Montag, 27. März 2023, 12:30–12:45, JAN 0027
The effect of photon recycling and back-grading on CIGS cell performance — •Seçil Güler1,2, Uwe Rau1,3, and Thomas Kirchartz1,2 — 1IEK-5 Photovoltaik, Forschungszentrum Jülich — 2NST and CENIDE, Universität Duisburg-Essen — 3Faculty of Electrical Engineering and Information Technology, RWTH Aachen University
Photon recycling, i.e. the reabsorption of photons created by radiative recombination within the solar cell, is the missing link between Shockley-Queisser model and classical diode theory. In order to determine the thermodynamic limits of solar cells, it is therefore necessary to consider the photon recycling process. This study aims at calculating the theoretical efficiency limits of Cu(In,Ga)Se2 (CIGS) solar cells using 1-dimensional drift-diffusion solvers by including the effect of photon recycling and bandgap grading. Simulations of current-voltage curves were performed by changing limiting factors such as back grading, back surface recombination velocity, electron and hole mobilities, and Shockley-Read-Hall (SRH) lifetime as well as the back reflection at the interface of the Mo/CIGS structure. We investigate under which circumstances photon recycling has a significant effect on device performance and study the optimum bandgap grading for different material properties.