Dresden 2020 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 41: Perovskite and photovoltaics III (joint session HL/CPP)
HL 41.4: Vortrag
Mittwoch, 18. März 2020, 10:15–10:30, POT 251
Environmental Stability of High Efficiency PbS Quantum Dot Solar Cells — •David Becker-Koch1,2, Miguel Albaladejo-Siguan1,2, Vincent Lami3, Fabian Paulus2, Hengyang Xiang4, Zhuoying Chen4, and Yana Vaynzof1,2 — 1IAPP, TU Dresden, Germany — 2cfaed, TU Dresden, Germany — 3KIP, Uni Heidelberg, Germany — 4ESPCI, CNRS, Université Pierre et Marie Curie, Paris, France
Colloidal inorganic quantum dot (CQD) solar cells (SCs) are an emerging class of photovoltaics, which can be processed from solution at low temperature and their optoelectronic properties can easily be tuned by changing their size, shape and surface passivation. While power conversion efficiencies of ~12% have been demonstrated by employing lead sulphide (PbS) CQDs, their stability remains an unresolved issue preventing them from being integrated into industrial applications. In this work we focus on the influence of different atmospheres on the performance of high efficiency PbS CQDs SCs. We find that while N2 and humidity lead to a quick decline in performance, oxidation dominates the initial improvement and the subsequent deterioration of the device function. By applying a range of spectroscopic methods, we identify the pivotal layer for these processes and furthermore, we propose a model for the performance evolution. We conclude that the stability and performance can be improved by exchanging the extraction layer (EL) ubiquitously used in these devices. Finally, we present several promising organic, semiconducting replacement ELs and show preliminary results of their application as ELs in PbS CQDs solar cells.