Diagnosis of Perovskite Solar Cells Through Absolute Electroluminescence-Efficiency Measurements

Abstract

Two organic-inorganic halide CH 3 NH 3 PbI 3 perovskite solar cells prepared in the same experimental batch but having different power conversion efficiencies −18.46% and 17.15%-were investigated based on the absolute electroluminescence (EL) efficiency measurements and traditional I-V measurements. The possible factors that affect the power conversion efficiency were also investigated. Comparing the experimental I-V curves of the two solar cells, it was found that the short-circuit currents (J sc) were nearly the same; however, the open-circuit voltages (V oc) were markedly different. Moreover, the deduced I-V curves from the absolute EL efficiencies of the two solar cells, which were mainly affected by the material quality, were almost the same, proving that the device processing technology has a vital effect on V oc.

Resistive Effects on the Spatially Resolved Absolute Electroluminescence of Thin-Film Cu(In, Ga)Se2 Solar Cells Studied by a Distributed Two-Diode Model

“…Measurements of absolute EL intensity [18] have been demonstrated usefully to obtain the internal current-voltage (I-V) relations of solar cells based on the basic reciprocity relationship [15], [16] between EL emission in light-emitting-diode (LED) operation and the external quantum efficiency (EQE) in solar-cell operation. Absolute EL imaging method has been developed to quantitative mapping the open-circuit voltage of Si solar cells and modules [19], as well as GaAs solar cells [20]- [22] and perovskite solar cells [23]. Various calibration techniques for obtaining absolute EL intensity have been proposed to characterize the properties of solar cells which demonstrated good accuracies [24].…”