Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.44: Poster

Monday, March 18, 2024, 15:00–18:00, Poster E

Nanoparticle and polymer based optical coating for stability and thermal management of perovskite solar cells — •Steffen Richter, Sema Sarisözen, Sercan Özen, Frank Jaiser, Thomas Hultzsch, and Felix Lang — Radiation-Tolerant Electronics with Soft Semiconductors , University of Potsdam, Germany

Photons with energies outside the band gap are not only not utilized, but often decrease performance and stability of perovskite solar cells. Harsh UV light can trigger various degradation mechanisms, while IR light leads to excessive heating.

Commercial protections are usually quite expensive. To increase the stability, reduce heat and improve performance with an affordable and simple approach we aim at introducing an optical coating containing various nanoparticles embedded into an encapsulating polymer.

Our first results show that indium tin oxide nanoparticles absorb and reflect near infrared light, while (aluminum doped) zinc oxide nanoparticles absorb ultraviolet radiation and downshift the latter to an emission in the visual spectrum. Further, PDMS as an embedding polymer acts like a natural anti reflection layer. Bioinspired structuring of the surface with rose petals decreases reflectance and increases transmittance additionally. In literature PDMS is used for radiative cooling because of its conversion of heat to emission in higher infrared wavelengths which could reduce the cell temperature even further.

In this poster we will present detailed transmission and reflection spectra as well as evidence of downshifting. Further, we will show how the optical coating will affect device performances.

Keywords: perovskite; nanoparticles; PDMS; photovoltaics; metal oxides