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HL: Fachverband Halbleiterphysik
HL 35: Perovskite and photovoltaics II (joint session HL/CPP)
HL 35.2: Vortrag
Dienstag, 17. März 2020, 14:15–14:30, POT 251
Solution-Processed Two-Dimensional Materials for Perovskite Optoelectronics — •Antonio Gaetano Ricciardulli1,2, Paul Blom2, and Michael Saliba1 — 1Technische Universität Darmstadt, Darmstadt, Germany — 2Max-Planck-Institut für Polymerforschung, Mainz, Germany
The efficiency of perovskite based perovskite solar cells and light-emitting diodes (PSCs and PLEDs, respectively) is limited by hole injection/transport and high leakage current, generated by a high hole injection barrier and poor perovskite morphology, respectively. Black phosphorus (BP), a newly emerged 2D layered semiconductor, is endowed with thickness-dependent bandgap, which spans from 0.3 eV (bulk) to 2.0 eV (monolayer). Hence, by carefully selecting the appropriate thickness, BP can be used as interlayer to enhance charge transport and injection in either PLEDs or PSCs. As a proof of concept, we reported a feasible strategy to reduce both hole injection barrier and defects at the perovskite interface by introducing 2D BP as hole injection layer in a PeLED stack. A continuous film composed of high*quality, ultrathin, and large BP sheets on top of PEDOT:PSS simultaneously improves the hole injection and morphology of the green*emitting CsPbBr3. Inclusion of BP enhances over 4 times efficiency of CsPbBr3 based PeLEDs. Incorporating BP to enhance the hole injection from PEDOT:PSS might also be of interest to increase the open*circuit voltage of PSCs of which the perovskite absorber has deeper valence band. Currently, we are developing novel PSCs based on 2D materials with specific functionalities.