Using TCAD simulations to optimize 2T Tandem Perovskite-Cu(In,Ga)Se2 solar cells
The maximum conversion efficiency a single junction solar cell can achieve is determined by its band gap, and is hence inherently limited by photon thermalization and transmission. Multiple-junction solar cells provide an opportunity to surpass the efficiency given by the Shockley-Queisser limit via a more optimized usage of the solar spectrum. A tandem structure consisting of the perovskite/CIGS combination is very promising for several reasons: i) both materials have high absorption coefficients and long diffusion lengths, ii) both absorbers have tunable band gaps which cover the ideal values of 1.7-1.9 eV for the top cell and 0.9-1.2eV for the bottom one iii) both devices have separately achieved high conversion efficiencies, and iv) both solar cells are thin-film structures allowing a possibility for flexible applications. An optimization of the tandem structure requires detailed measurements and an accurate interpretation of the data.
Status: Ongoing
Date of proposal: 30/08/2022
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