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http://hdl.handle.net/2445/193377
Title: | Expanding the perspective of polymeric selective contacts in photovoltaic devices using branched polyethilimine |
Author: | Ros Costals, Eloi Tom, Thomas Rovira, David López Vidrier, Julià Masmitjà, Gerard Pusay, Benjamin Almache, Estefania Martin Garcia, Isidro Jimenez, Maykel Saucedo Silva, Edgardo Tormos, Eva Asensi López, José Miguel Ortega Villasclaras, Pablo Rafael Bertomeu i Balagueró, Joan Puigdollers i González, Joaquim Voz Sánchez, Cristóbal |
Keywords: | Silici Cèl·lules solars Silicon Solar cells |
Issue Date: | 5-Sep-2022 |
Publisher: | American Chemical Society |
Abstract: | This work studies the use of polymeric layers of polyethylenimine (PEI) as an interface modification of electron-selective contacts. A clearly enhanced electrical transport with lower contact resistance and significant surface passivation (about 3 ms) can be achieved with PEI modification. As for other conjugated polyelectrolytes, protonated groups of the polymer with their respective counter anions from the solvent create an intense dipole. In this work, part of the amine groups in PEI are protonated by ethanol that behaves as a weak Brønsted acid during the process. A comprehensive characterization including highresolution compositional analysis confirms the formation of a dipolar interlayer. The PEI modification is able to eliminate completely Fermi-level pinning at metal/semiconductor junctions and shifts the work function of the metallic electrode by more than 1 eV. Induced charge transport between the metal and the semiconductor allows the formation of an electron accumulation region. Consequently, electron-selective contacts are clearly improved with a significant reduction of the specific contact resistance (less than 100 mΩ·cm2). Proof-of-concept dopant-free solar cells on silicon were fabricated to demonstrate the beneficial effect of PEI dipolar interlayers. Full dopant-free solar cells with conversion efficiencies of about 14% could be fabricated on flat wafers. The PEI modification also improved the performance of classical high-efficiency heterojunction solar cells. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1021/acsaem.2c01422 |
It is part of: | ACS Applied Energy Materials, 2022, vol. 5, num. 9, p. 10702-10709 |
URI: | http://hdl.handle.net/2445/193377 |
Related resource: | https://doi.org/10.1021/acsaem.2c01422 |
ISSN: | 2574-0962 |
Appears in Collections: | Articles publicats en revistes (Física Aplicada) |
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File | Description | Size | Format | |
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725240.pdf | 2.74 MB | Adobe PDF | View/Open |
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