Photoluminescence assessment of materials for solar cell absorbers

Abstract

Absolute photoluminescence measurements present a tool to predict the quality of photovolatic absorber materials before finishing the solar cells. Quasi-Fermi level splitting predicts the maximal open circuit voltage. However, various...

30% efficient triple-cation perovskite solar cells under indoor illumination enabled by rare earth EuCl3 doping

“…2d) was E g,PL = 1.60 eV. These 20 meV differences are consistent with the systematic errors mentioned by Siebentritt et al 43 The absorption edge extracted from the EQE spectrum was E g,PV = 1.56 eV (Fig. S9 †).…”

Chalcopyrite solar cells —state-of-the-art and options for improvement

“…A distribution of bandgaps has similar effects [78,79], but would be observed near the effective band gap [80,81]. State-of-the-art chalcopyrite solar cells certainly suffer from a distribution of band gaps, visible in the broadening of the onset of absorptance [82] or the quantum efficiency [79], which is due to the intentionally graded band gap. The effects of tail states and band gap distribution are linked and difficult to disentangle experimentally.…”

Sulfide Chalcopyrite Solar Cells––Are They the Same as Selenides with a Wider Bandgap?

“…[ 63 ] For the new data (Cu‐poor Cu(In,Ga)S 2 ), the qFls loss was directly determined from the radiative efficiency ( Y PL ) according to –k T ln Y PL . [ 63,86 ] Concerning the CuInS 2 samples, we can see that at least for Cu‐rich material, higher growth temperatures are beneficial. [ 68 ] In the literature, an inprovement with higher growth temperature has also been observed in Cu‐poor absorbers.…”

“…In this case, qFls loss is determined directly from the radiative efficiency (Y PL ) according to -kT lnY PL . [63,86] These experiments were done on soda-lime glass.…”

“…The bandgap to determine should be taken as the PV bandgap, determined from the inflection point of the external quantum efficiency (EQE) spectrum of the short‐circuit current [ 85 ] or the absorptance spectrum. [ 86 ] Figure gives an overview of how the qFls loss depends on the Cu/In or Cu/(In+Ga) atomic ratio. The qFls loss values are based on qFls values determined from a fit to generalized Planck's law, keeping the temperature in the fit to the measurement temperature.…”