IPVF is a public-private partnership dedicated to accelerating energy transition through science & technology. The core values of IPVF are Excellence, Innovation, Collaboration. Its collaborative research initiative brings together internationally recognized academic research teams and industrial leaders. It is structured into 6 programmes.

Programme 4 is dedicated to
developing and applying innovative and high-performance characterization and modeling techniques.

Understanding and optimizing optical properties of solar cells

Within the new programs of IPVF, Program IV entitled “Characterization, Reliability and Modelling” (CHARMING!) aims at studying the performance and reliability issues of the other programs, in order to continuously improve devices stability and efficiency. It particularly focuses on providing detailed analysis to Perovskite, III-V and Solar to Fuel technological programs. Daniel Ory, in charge of the “Luminescence” part of program IV, explains us the ambition of the program.

How do you work on this program? What are your objectives?

Program IV is divided into six transverse but distinct parts. I’m heading the Luminescence project. This platform should enable us to design and apply advanced luminescence techniques in order to characterize fresh and post-ageing photovoltaic materials and devices. These studies are strongly supporting what are developed in the other programs.

Luminescence techniques consist of multi-dimensional analysis of the “intrinsic” light of photovoltaic materials and cells. The variety of accessible characteristics is very wide. This makes it possible to explain how captured light is transformed into electrons, which will be able to create a current while preventing them from being lost.

We put strong emphasis in understanding needs of other programs, in order to provide them the most appropriate techniques of investigation. We are interacting with them very closely. Indeed, our colleagues need innovative and user-friendly characterization techniques, which provide high-value and pragmatic results, whether on a small scale or on large surfaces.

In addition, we are conducting studies to develop innovative characterization techniques, always based on luminescence, in order to increase our offer and remain at the forefront of our field.

Finally, we will strengthen our ability to test and understand the behavior of photovoltaic materials and devices during ageing. This is because perovskite is, according to the current state of knowledge, not sufficiently stable and its ageing begins as soon as it is produced.

Why did you get involved in this IPVF program?

The characterization of solar cells by luminescence has been developed intensively since several years, and is one of the strengths of IPVF. I wanted to bring my experience in this field to improve laboratory capabilities, and provide other programs with new and more user-friendly tools.

The “Luminescence” project is rather ambitious, the characterization team is gradually being strengthened, and the significant material resources allocated, as well as effective collaboration with the other work packages of Program IV, should enable us to succeed.

How did you enter the PV R&D arena?

 I have been an EDF research engineer for 6 years and I also work for IPVF. This is a professional reorientation, as I was previously an engineer in the automotive industry.

Since then, I have been studying and developing innovative characterization methods, mainly in the optical field. The aim is to analyze the functioning of cells and to improve absorbers by studying their optical response to external stress. I work as much on electroluminescence (emission of light in response to electrical excitation) as on photoluminescence (emission of light in response to light excitation).

Daniel Ory

EDF

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