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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.36: Poster
Monday, March 27, 2023, 18:00–20:00, P3
Interfacial engineering via modifications of the electron blocking layer in PbS quantum dot solar cells — •Timo Piecuch1, Huaying Zhong1, and Peter Müller-Buschbaum1,2 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2MLZ, TUM, Garching, Germany
Colloidal quantum dot solar cells (CQDSCs) have received tremendous attention as next generation solar cells. Best performances up to 15% power conversion efficiency (PCE) have been achieved using lead sulfide quantum dots in a heterojunction cell architecture. PbS is especially efficient in the infrared region, and thus particular interesting for future applications like space satellites. Research in the last years mainly has focused on improving the absorber layer and the hole blocking layer, but the potential by improving the electron blocking layer (EBL) has recently aroused increasing interest. In order to reduce interfacial charge carrier recombination and capture the large fraction of long wavelength photons at the EBL/active layer interface, the different interfacial energy-level offsets between EBL and absorber layer, tuned by the EBL-QDs size, are investigated using ultraviolet photoelectron spectroscopy (UPS) and absorption spectroscopy. Furthermore, the corresponding photovoltaic performances are characterized to demonstrate improved interfacial band alignment.