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2022-09-05

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/193377

Expanding the perspective of polymeric selective contacts in photovoltaic devices using branched polyethilimine

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https://doi.org/10.1021/acsaem.2c01422

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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.

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Silici, Cèl·lules solars

Matèries (anglès)

Silicon, Solar cells

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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. Expanding the perspective of polymeric selective contacts in photovoltaic devices using branched polyethilimine. _ACS Applied Energy Materials_. 2022. Vol. 5, núm. 9, pàgs. 10702-10709. [consulta: 25 de febrer de 2026]. ISSN: 2574-0962. [Disponible a: https://hdl.handle.net/2445/193377]

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