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Postdoctoral Fellow in Organic-Inorganic Hybrid Materials for Photovoltaics

Employer
Global Academy Jobs
Location
France
Closing date
Jun 1, 2018

Job Details

In the framework of the cluster of Excellence “Advanced MAterials by Design” (AMADEus) of the University of Bordeaux, this project aims at developing new methodologies allowing the characterization of electronic features of materials and interfaces of hybrid perovskite solar cells. While lead halide hybrid perovskites have attracted tremendous worldwide interest for low-cost and high-efficiency solar cells, with power conversion efficiencies increasing from 3.9% up to over 22 % in less than ten years, there are still some open scientific questions prior to their further development and industrialization. So far the most efficient systems are based on the FTO/TiO2/lead perovskite/hole transporter/Au architecture. The limitations are mainly due to hysteresis and stability issues related to the one hand to the interface between TiO2 and the lead perovskite, and on the other hand to the hole-transporter layer which usually includes dopants.

In this context, it was recently shown in the framework of our LIA jointlab 'Next-PV' that combining a porous TiO2 layer with the introduction of K+ cations within the perovskite enables to solve hysteresis issues. In addition, the use of functional polyvinylcarbazoles and ionic liquid polymers in the hole-transporting layer has led to enhanced performance and stability. Nonetheless, the origin of the improvements has not been rationalized yet. As a consequence, the objective of this project is the thorough characterization of the different interfaces present in these devices by exploiting the facilities offered by the ELORPrintTec facility.

The working plan will consists in the following steps: i) Fabrication and characterization of state of the art perovskite solar cells involving functional polyvinylcarbazoles and ionic liquid polymers; ii) Characterization of the morphology and electronic properties of the perovskite layers (SEM, UV-visible, fluorescence, UPS); iii) Characterization of the atomic composition and band alignment at the different interfaces present in the devices by UPS, XPS and IPES analyses: a) TiO2/lead perovskite; b) lead perovskite/hole transporting layer; c) hole-transporting layer/gold.

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