Valentin Ianis Emmanuel Queloz

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Beyond Tolerance Factor: Using Deep Learning for Prediction Formability of ABX3 Perovskite Structures

Alexander Fedorovskiy, Mohammad Khaja Nazeeruddin, Valentin Ianis Emmanuel Queloz

Deep learning (DL) is a modern powerful instrument for multiple purposes, including classification. In this study, this technique is applied to the task of perovskites formability. A commonly known perovskite dataset is used to try to make an instrument superior to the 'classic' geometric approach. The authors found that the resulting models allow the finding of inaccuracies in the data and can successfully forecast perovskite formability with an accuracy of over 98% for the best case.

2021

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Phosphine Oxide Derivative as a Passivating Agent to Enhance the Performance of Perovskite Solar Cells

Aron Joel Huckaba, Cansu Igci, Hiroyuki Kanda, Hobeom Kim, Mounir Driss Mensi, Mohammad Khaja Nazeeruddin, Valentin Ianis Emmanuel Queloz, Albertus Adrian Sutanto

Defects of metal-halide perovskites detrimentally influence the optoelectronic properties of the thin film and, ultimately, the photovoltaic performance of perovskite solar cells (PSCs). Especially, defect-mediated nonradiative recombination that occurs at the perovskite interface significantly limits the power conversion efficiency (PCE) of PSCs. In this regard, interfacial engineering or surface treatment of perovskites has become a viable strategy for reducing the density of surface defects, thereby improving the PCE of PSCs. Here, an organic molecule, tris(5-((tetrahydro-2H-pyran-2-yl)oxy)pentyl) phosphine oxide (THPPO), is synthesized and introduced as a defect passivation agent in PSCs. The P.O terminal group of THPPO, a Lewis base, can passivate perovskite surface defects such as undercoordinated Pb2+. Consequently, improvement of PCEs from 19.87 to 20.70% and from 5.84 to 13.31% are achieved in n-i-p PSCs and hole-transporting layer (HTL)-free PSCs, respectively.

2021

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Hybrids organic-inorganic perovskite(HOP) solar cells have unequivocally the potential for being a new generation of solar panels with a lower cost and a greater efficiency than well-known silicon solar panels. Today, even if HOPs are seen as one of the best ways to overcome climate change, they still have drawbacks to overcome, such as limited stability, especially in humid conditions. The more stable 2D perovskites, a low-dimension subfamily of the HOP is a good candidate to protect the 3D HOP while keeping a good efficiency. The understanding of the interaction between the 2D and the 3D perovskite is crucial to push the HOP cell toward the next step. Finally MoS2 nano flakes where investigated. We revealed the entire free carrier dynamics which is crucial for its use as a buffer layer in highly efficient and stable solar cell.

EPFL2021

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