Reference : UMR7325-VALSEV-073
Workplace : MARSEILLE 09
Date of publication : Wednesday, September 21, 2022
Scientific Responsible name : Christine Videlo Ackermann
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 January 2023
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Thanks to the rise of non-fullerene acceptors (NFA) and their incorporation on ternary blends, photovoltaic power conversion (PCE) of polymer based solar cells has increased last years, up to 19% for devices of some mm2 active surface. Despite this improvement at lab scale, when we try to scale up, atmospheric jet-ink printing of cm2 devices with industrial interfacial materials performances are severely reduced. In order to reduce the gap between lab and industrial production, but also for achieving stability lifetimes of 10 years, the main challenge is to tackle the main weaknesses of NFA technology. These NFAs and their processing must be compatible with the industrial requirements for obtaining NFA based thick films, both stable and performing. For achieving these objectives, the project in which this thesis take part will focus in the following points:
i) A better comprehension of photodegradation mechanisms both in NFA and solar cells
ii) Synthesis of new NFA, both molecules and polymers, with a better structural and photochemical stability
iii) The implementation of a machine learning algorithm for optimization of the blend ternary composition in thick layered devices for improved performances.
New NFA polymers will enable the fabrication of all-polymer devices with a strong potential for solving morphology related problems, thus improving stability and electrical mobility. Moreover, by means of X-ray diffraction, Raman spectroscopy and OFET, the study of crystallinity and charge mobility both on binary and ternary blends aims the improvement of performances for thick-layer based devices, and structural stability and photostability.
The objective of this thesis is to produce new NFA to achieve more than 15% PCE with a 10-year stability on cm2 solar cells compatibles with industrial requirements.
This thesis will be developed between two CNRS laboratories, CINaM (UMR 7325) and IM2NP (UMR 7334) in Marseilles. The recruited person will be responsible for carrying out experimental work on organic photovoltaic cells. This thesis project will be conducted within FUN team (FUnctional Nanomaterials) at CINaM laboratory and LUMEN-PV team (Light Ultimate MatErials Nanodevices and PV) at l'IM2NP. Both teams have great know-how in the production and characterization of components for opto-electronics.
Candidates must have solid knowledge in materials chemistry but also in physics and chemistry-physics. We are looking for persons with an excellent aptitude for teamwork, taking initiatives, having analytical skills and a great capacity for autonomy. Also, candidates must have a good command of written/spoken English (enough to write scientific publications/technical documentation and to communicate easily within international teams and when participating in conferences).
Applications (CV, qualification transcripts, cover letter and letters of recommendation) should be sent to firstname.lastname@example.org and email@example.com.
Constraints and risks
Usual risks and constraints of research laboratory work
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