Waterproof deformable hybrid solar cells

Project Director: Dr. Oana Rasoga

Contract no.: PN-III-P4-ID-PCE-2020-1691
Project Director: Dr. Oana Rașoga
Project Type: National
Project Program: PCE
Funded by: Romanian Ministry of Education and Research, CNCS - UEFISCDI
Contractor: National Institute of Materials Physics
Project Status: In progress
Start Date: January 4th, 2021
End Date: December 31st, 2023

Combining the major problem of the world in terms of the global warming due to the greenhouse gases that implies the need of renewable clean energy and the progress in electronics the new recent direction in electronics seeks to develop methods and materials that can: (i) offer a feasible alternative source of clean renewable energy based on solar radiation (ii) enable high performance of the devices and (iii) sustain mechanical deformation.
The present project proposes a new type of organic flexible hybrid solar cell, combining the properties of both, organic material and silicon for low-cost organic photovoltaic devices. The proposed structure type is consisting in an elastomeric solar cell based on: thin truncated conical Si patterns incorporated in a donor/acceptor blend between the two transparent, flexible, metallic electrodes.
The main objectives of the project are the following:
(1) Realization of the truncated Si inverted nano-cones;
(2) Deposition of the organic materials above the Si inverted nano-cones;
(3) Elastomeric embedding of the obtained structure and substrate detachment;
(4) Front and rear electrode contact deposition and characterization of the structures.
The addressed methodology will imply the nanoimprint technology for truncated cones-patterning, matrix assisted pulsed laser evaporation for the organics, spin-coating for the PEDOT:PSS and electrospinning for the deposition of the metallic electrodes.

Dr. Oana Rașoga
Dr. Anca Stănculescu
Dr. Marcela Socol
Dr. Marius-Andrei Avram
Dr. Carmen Breazu
Dr. Gianina Popescu-Pelin
Dr. Alexandru Evanghelidis
Dr. Loredana Văcăreanu
Drd. Gabriela Petre
Tech. Maria Rădulescu

Stage I: Realization of truncated silicon nanocones (4.01.2021-31.01.2021)

A. Stage summary

During the stage 04.01.2021 - 31.12.2021, 6 activities were established, respectively: (1) Activity 1.1: Realization of patterns by UV-NIL and synthesis of organic materials. Within this activity, structures were made using the lithographic printing technique. A beautiful collaboration was also created with those from EVG (Austria) who also contributed to the achievement of the results. Two types of working masks were used and also purchased another two. The desired oligomers were synthesized and tested for the use in solar cell structures. (2) Activity 1.2: Wet or dry corrosion of patterned substrates in order to obtained silicon patterns. This activity complements the previous one, consisting in the transfer of the patterns into the silicon layer. For this purpose, dry corrosion was carried out at cryogenic temperatures as well as wet corrosion using different types of solutions such as: Piranha, Royal water, aqueous HF solution and KOH solution. (3) Activity 1.3: Characterization of the truncated nanocones patternes by SEM, AFM, FTIR, synthesized organic materials and a characterization of the initial structures. In this activity, the results of the previous activities were highlighted, through SEM, FTIR or AFM analyzes in order to see what needs to be improved / optimized in the manufacturing processes. (4) Activity 1.4: Optimization of the paterning and chemical etching processes; Following the results obtained in the characterization of the samples, the parameters of the nanoimprint process were improved by establishing the optimal spincoating parameters, an attempt was made to optimize wet etching processes by testing different solutions or concentrations. (5) Activity 1.5: Characterization of optimized nanopaterns by SEM, AFM, FTIR. In this activity, the structures previously obtained through the related techniques were analyzed. In addition, classical structures for photovoltaic applications have been developed in order to test the synthesized oligomers as well as other substances. (6) Activity 1.6: Dissemination of the results obtained for the classic structure as well as the creation of the WEB page. This activity was strictly related to the presentation of the results of the whole team, following as requested by the project evaluators for the project director to improve his CV in terms of oral presentations at conferences. Therefore, the PhD student in the project had a poster presented at EMRS Spring, and the project director two oral presentations at EMRS Fall and CAS 2021. The effort to disseminate the results was a team effort and not only, proven by the papers submitted or accepted.

(i) ”Organic heterostructures with indium-free transparent conductor electrode for opto-electronic applications” -Poster , authors: G. Petre, A. Stanculescu, M. Girtan, M. Socol, C. Breazu, L. Vacareanu, M. Grigoras, N. Preda, O. Rasoga, F. Stanculescu, (speaker Gabriela Petre) at E-MRS 2021 Spring Meeting Conference;
(ii) ” Effect of Aluminum nanostructured electrode on the properties of bulk heterojunctions based heterostructures for electronics”, oral presentation, authors: O. Rasoga, C. Breazu, M. Socol, A.-M. Solonaru, L. Vacareanu, G. Petre, N. Preda, A. Stanculescu, F. Stanculescu, G. Socol, M. Girtan, A. Doroshkevich; (speaker Oana Rașoga) at E-MRS 2021 Fall Meeting Conference;
(iii) ” Wafer-level fabrication of nanocones structures by UV-nanoimprint and cryogenic deep reactive ion process”, oral presentation, authors: Oana Rasoga, Christine Thanner, Olga Semenova, Andrei Marius Avram, Luiza-Izabela Jinga; (speaker Oana Rașoga) at CAS 2021 Conference .

Scientific papers:
1. Petre, G., Stanculescu, A., Girtan, M., Socol, M., Breazu, C., Vacareanu, L., Preda, N., Rasoga, O., Stanculescu, F. and Doroshkevich, A.S. (2022), Organic Heterostructures with Indium-Free Transparent Conductor Electrode for Optoelectronic Applications. Phys. Status Solidi A 2100521. https://doi.org/10.1002/pssa.202100521;
2.Stanculescu, A.; Socol, M.; Rasoga, O.; Breazu, C.; Preda, N.; Stanculescu, F.; Socol, G.; Vacareanu, L.; Girtan, M.; Doroshkevich, A.S. Arylenevinylene Oligomer-Based Heterostructures on Flexible AZO Electrodes. Materials 2021, 14, 7688. https://doi.org/10.3390/ma14247688
3.O. Rasoga, C. Thanner, O. Semenova, A. M. Avram and L. -I. Jinga, "Wafer-level fabrication of nanocones structures by UV-nanoimprint and cryogenic deep reactive ion process," 2021 International Semiconductor Conference (CAS), 2021, pp. 39-42, doi: 10.1109/CAS52836.2021.9604179.


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