sujet these disatech UK

De Pisan Christine

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Ph.D. proposal n°1: Ink formulation for prignatniicg soorlar cells on large areasOrganic optoelectronic devices (light emittinge sd,i odsolar cells, transistors) are processed from low molecular weight organic molecules uogr atceodn jpolymers. Some of these materials can be soluble, and in that case, can be procreinstsiendg bteyc hpnologies using inks. This feature makesorganic materials interesting to develop at lto wf lecxoibsle devices on large areas. Several printingtechnologies have been successfully exploited vteol opd eprototypes, but the obtained devices still suffer from several important limitations, sucrhe duacse d performance, poor stability and reproducibility. Different solutions addressings et hiessues exist: the use interfacial layers ieor r barrlayers, the development of new organic moletchu leism pwroived properties, the formulation of inks including nanoparticles, etc. Some of these nss olaurteio still far from being validated, and other approaches have still to be explored. Yet, ielidn othf e phfotovoltaic cells, the performance of organic solar cells at the laboratory scale paareti blceo mwith realistic applications, if it bilse ptoos sidemonstrate that efficient solar panels can bicea tefda brusing industrial deposition technologies such as printing techniques. The industrial prboejtewcteen the XLIM Institute and the DISATECH Company focuses on addressing this particular, istshureough the Ph.D. positions proposed within the ...

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• Publié par: Nuching
• Nombre de lectures: 19
• Langue: English

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Ph.D. proposal n°1: Ink formulation for printing organic solar cells on large areas

Organic optoelectronic devices (light emitting diodes, solar cells, transistors) are processed from low molecular weight organic molecules or conjugated polymers. Some of these materials can be soluble, and in that case, can be processed by printing technologies using inks. This feature makes organic materials interesting to develop at low cost flexible devices on large areas. Several printing technologies have been successfully exploited to develop prototypes, but the obtained devices still suffer from several important limitations, such as reduced performance, poor stability and reproducibility. Different solutions addressing these issues exist: the use interfacial layers or barrier layers, the development of new organic molecules with improved properties, the formulation of inks including nanoparticles, etc. Some of these solutions are still far from being validated, and other approaches have still to be explored. Yet, in the field of photovoltaic cells, the performance of organic solar cells at the laboratory scale are compatible with realistic applications, if it is possible to demonstrate that efficient solar panels can be fabricated using industrial deposition technologies such as printing techniques. The industrial project between the XLIM Institute and the DISATECH Company focuses on addressing this particular issue, through the Ph.D. positions proposed within the project. More specifically, this 3-year Ph.D. position focuses on the characterization of photo- electrical and topographic properties of organic active layers as a function of ink formulation and printing technique. Initially, inks will be based on a P3HT-PCBM mixture, without incorporation of nanoparticles. A specific study will focus on the mixture composition and molecule orientation in order to improve the open-circuit voltage, hence the power conversion efficiency, of the solar cells. This Ph.D. studentship will exploit the expertise of the XLIM laboratory on the processing and characterization of organic solar cells (specific know-how on composition and thermal treatment of active layers). Team work will be particularly important for this project which aims at demonstrating the industrial feasibility of a printing technology compatible with large areas for the fabrication of prototype products at low costs. Successful applicants are expected to have a master degree in the field of Physics-Chemistry, or equivalent background.

Ph.D. proposal n°2: Development of “on line”characterization techniques for organic solar cells Organic optoelectronic devices (light emitting diodes, solar cells, transistors) are processed from low molecular weight organic molecules or conjugated polymers. Some of these materials can be soluble, and in that case, can be processed by printing technologies using inks. This feature makes organic materials interesting to develop at low cost flexible devices on large areas. Several printing technologies have been successfully exploited to develop prototypes, but the obtained devices still suffer from several important limitations, such as reduced performance, poor stability and reproducibility. Different solutions addressing these issues exist: the use interfacial layers or barrier layers, the development of new organic molecules with improved properties, the formulation of inks including nanoparticles, etc. Some of these solutions are still far from being validated, and other approaches have still to be explored. Yet, in the field of photovoltaic cells, the performance of organic solar cells at the laboratory scale are compatible with realistic applications, if it is possible to demonstrate that efficient solar panels can be fabricated using industrial deposition technologies such as printing techniques. The industrial project between the XLIM Institute and the DISATECH Company focuses on addressing this particular issue, through the Ph.D. positions proposed within the project. More specifically, this 3-year Ph.D. position focuses on the development of characterization techniques devoted to organic solar cells, compatible with industrial production lines on large areas and at high rates. The candidate will develop non-destructive testing tools based on compact and low-cost pulsed laser sources. Solar panels will be addressed using a programmable scanner (2-axes galvanometric mirrors) driving the beam. This generic device should enable the measurement of three fundamental physical properties of the solar panels: -The external quantum efficiencyor incident photon to current efficiency -The charge carrier lifetimes -The fluorescence lifetime This Ph.D. studentship will exploit the expertise of the XLIM laboratory on the processing and characterization of organic solar cells (specific know-how on composition and thermal treatment of active layers). Team work will be particularly important for this project which aims at demonstrating the industrial feasibility of a printing technology compatible with large areas for the fabrication of prototype products at low costs. Successful applicants are expected to have a master degree in the field of Applied Optics and Photonics, or equivalent background.

Ph.D. proposal n°3: Surface and interface functionalization in organic solar cells Organic optoelectronic devices (light emitting diodes, solar cells, transistors) are processed from low molecular weight organic molecules or conjugated polymers. Some of these materials can be soluble, and in that case, can be processed by printing technologies using inks. This feature makes organic materials interesting to develop at low cost flexible devices on large areas. Several printing technologies have been successfully exploited to develop prototypes, but the obtained devices still suffer from several important limitations, such as reduced performance, poor stability and reproducibility. Different solutions addressing these issues exist: the use interfacial layers or barrier layers, the development of new organic molecules with improved properties, the formulation of inks including nanoparticles, etc. Some of these solutions are still far from being validated, and other approaches have still to be explored. Yet, in the field of photovoltaic cells, the performance of organic solar cells at the laboratory scale are compatible with realistic applications, if it is possible to demonstrate that efficient solar panels can be fabricated using industrial deposition technologies such as printing techniques. The industrial project between the XLIM Institute and the DISATECH Company focuses on addressing this particular issue, through the Ph.D. positions proposed within the project. More specifically, this 3-year Ph.D. position focuses on two main objectives: -The use of functionalized surfaces for the implementation of organic solar cells. This aspect is crucial for proper device operation and in order to limit active layer degradation. It will focus both on electrode work function tailoring using adapted dipoles and on nanoparticles functionalization to be incorporated in the active layer. The quality of surface treatment will be assessed using near-field microscopic techniques such as classical AFM, Kelvin probe microscopy, or STM. -The development of suitable solar module architectures, both from a geometrical point of view, as well as regarding cell inter-connexions. This Ph.D. studentship will exploit the expertise of the XLIM laboratory on the processing and characterization of organic solar cells (specific know-how on composition and thermal treatment of active layers). Team work will be particularly important for this project which aims at demonstrating the industrial feasibility of a printing technology compatible with large areas for the fabrication of prototype products at low costs. Successful applicants are expected to have a master degree in the field of Solid-State Physics, or equivalent background. Related Postdoctoral Research Associate positionduring the first year of the Ph.D.: the successful applicant will perform the surface and nanoparticle functionnalizations.