[11a-Z11-1~11] 12.5 Organic solar cells

▲ [11a-Z11-7] Understanding of Open Circuit Voltage Loss Mechanism in Perovskite Solar Cells

〇(M2)Yulu He^1,2, Imane Abdellaoui¹, Towhid Hossain Chowdhury², Ashraful Islam², Takeaki Sakurai¹ (1.Tsukuba Univ., 2.NIMS)

Keywords:Perovskite solar cells, Recombination, Voc loss

For methylammonium lead triiodide (MAPbI₃) perovskite solar cells, the radiative open circuit voltage (V_oc) limit can be calculated to be 1.311 V (Short circuit current Jsc = 19.6 mA/cm²). The radiative lifetime (5.4 us) can be estimated according to the absorption coefficient of the MAPbI₃ layer. From TRPL measurement, the bulk lifetime (149 ns) of the MAPbI₃ layer can be obtained. So that the V_oc limit (1.223 V) from the bulk recombination was estimated. The V_oc limit from the bulk is still much higher than the real V_oc value (1.068 V) of the device so that the non-recombination in the interface is dominant V_oc loss mechanism can be considered.