Erratum: “Microscopic origins of radiative performance losses in thin-film solar cells at the example of (Ag,Cu)(In,Ga)Se₂ devices” [J. Vac. Sci. Technol. A 42, 022803 (2024)]

In a recent publication,¹ the microscopic origins of radiative losses in the open-circuit voltages (V_oc) of thin-film solar cells were discussed. It was highlighted that the radiative V_oc losses can be quantified via the band-gap broadening σ_gap from the first derivative of the external quantum efficiency (EQE) or absorptance spectrum around the band-gap energy (E_gap). The Urbach energy E_U as a function of the photon energy E_ph can be obtained by applying^2–4,Here, C is a constant. Equation (1) describes a linear relationship between ln[a(E_ph)] and E_ph with the slope E_U⁻¹. In Ref. 1, the Urbach energies were extracted close to the band-gap energy (see Fig. 1). It is apparent from Fig. 1 that the extraction of E_U close to E_gap (1.11 eV) results in large Urbach energy values, mainly since in this E_ph region, there is a strong impact by the band-gap broadening [and also since the approach depicted by Eq. (1) results in an overestimation of E_U, as already mentioned in Ref. 1]. E_U is correctly assessed in E_ph regions where EQE(E_ph) exhibits a linear dependency on the photon energy (at around 1.05 eV in Fig. 1). The corresponding is discussed more in detail in Ref. 5.