Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 25: Perovskite and photovoltaics I (joint session HL/CPP)
HL 25.4: Talk
Tuesday, March 17, 2020, 10:15–10:30, POT 251
Two-Dimensional Perovskite Solar Cells with 14.1% Power Conversion Efficiency and 0.68% External Radiative Efficiency — •Weifei Fu1,2, Alex K.-Y Jen1, and Michael Saliba2 — 1University of Washington, Seattle, Washington 98195, United States — 2Technical University of Darmstadt, Darmstadt, Germany
Quasi-2D perovskites are attractive due to their improved stability compared to 3D counterparts but they suffer from reduced performance. Here we report an efficient quasi-2D perovskite (PEA)2(MA)4Pb5I16 based optoelectronic device processed with NH4SCN and NH4Cl additives, showing a stabilized photovoltaic power conversion efficiency as high as 14.1 % (average value 12.9+_0.8 %), among the highest performing quasi-2D perovskite solar cells. These additives increase the perovskite crystallinity and induce a preferred orientation with the (0k0) planes perpendicular to the substrate, resulting in improved transport properties hence increased short-circuit current density. Furthermore, the NH4Cl treatment enriches the Cl- concentration near the PEDOT:PSS/perovskite interface, which passivates the electron traps leading to an enhanced electroluminescence external quantum efficiency (0.68% at +2.5 V bias). As a result, high open-circuit voltages of 1.21+_0.01 V with a record-low non-radiative VOC loss of only ~ 0.16 V could be achieved for the quasi-2D perovskite system.