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HL: Fachverband Halbleiterphysik
HL 60: Perovskite and photovoltaics V (joint session HL/CPP)
HL 60.5: Vortrag
Donnerstag, 19. März 2020, 11:00–11:15, POT 251
Tuning the Grain Size and Porosity of MAPbI3 Perovskite films for High Efficiency Solar Cells — •Qingzhi An1,2, Fabian Paulus1,2, and Yana Vaynzof1,2 — 1Integrated Center for Applied Photophysics and Photonic Materials, TU Dresden, Germany — 2Center For Advancing Electronics Dresden (cfaed), TU Dresden, Germany
In this work, a facile approach to control perovskite grain size and porosity is introduced. By slightly tuning the amount of H3PO2 (HPA) in the perovskite precursor solution, we demonstrate that the average perovskite grain size can be enlarged by one magnitude regardless of the underlying charge extraction layer. We correlate these microstructural changes to the photovoltaic performance of devices and demonstrate that optimal HPA concentration leads to open circuit voltages of 1.16 V and a power conversion efficiency of 19 %. We also demonstrate that further increase in the HPA amount in perovskite precursor solution results in the formation of a regular, porous perovskite networks with highly degree of crystalline orientation. Such porous structures can be of great interest to application in light-emitting diodes or semitransparent photovoltaic devices. This work demonstrates that tuning the fraction of HPA in perovskite precursor solution is an effective method to control the perovskite grain size and layer topology.