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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.16: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
Pathways towards 30% efficient single-junction perovskite solar cells — •Jonas Diekmann1, Pietro Caprioglio1, Daniel Rothhardt1, Malavika Arvind1, Thomas Unold2, Thomas Kirchartz3,4, Dieter Neher1, and Martin Stolterfoht1 — 1University of Potsdam — 2Helmholtz-Zentrum-Berlin — 3Forschungszentrum Jülich — 4University of Duisburg-Essen
Perovskite semiconductors have demonstrated outstanding external luminescence quantum yields, therefore potentially allowing power conversion efficiencies (PCE) close to the thermodynamic limits. In this work, we establish a simulation model that well describes efficient p-i-n type perovskite solar cells (PCE = 20%) and a range of different experiments helping to quantify the efficiency-limiting processes in state-of-the-art devices. Based on these results, we studied the role of important device and material parameters with a particular focus on chemical doping, carrier mobilities, energy level alignment and the built-in potential across all stack layers. We demonstrate that an efficiency regime of 30% can be unlocked by optimizing the built-in potential across the perovskite layer by using either highly doped thick transport layers (TLs) or ultrathin undoped TLs, e.g. self-assembled monolayers. Importantly, we only consider parameters that have been already demonstrated in recent literature, that is a bulk lifetime of 0.01 ms, interfacial recombination velocities of 100 cm/s, a perovskite bandgap of 1.47 eV and an EQE of 95%. A maximum efficiency of 31% is obtained for a bandgap of 1.4 eV using doped TLs.