Utilisation of PEDOT as a Hole Selective Layer for Reproducible Efficient Tin-Based Perovskite Solar Cells with the DMSO-Free Solvent System

When and Where

Nov 30, 2022
8:00pm - 10:00pm

Hynes, Level 1, Hall A

Presenter

Ece Aktas

Diego Di Girolamo

Corinna Ponti

Antonio Abate

Co-Author(s)

Ece Aktas¹,Diego Di Girolamo¹,Corinna Ponti¹,Antonio Abate^1,2

University of Federico II¹,Helmholtz-Zentrum Berlin für Materialien und Energie²

Abstract

Ece Aktas¹,Diego Di Girolamo¹,Corinna Ponti¹,Antonio Abate^1,2

University of Federico II¹,Helmholtz-Zentrum Berlin für Materialien und Energie²

Hybrid metal-organic lead-based perovskite solar cells (PSCs) have shown great performance as a photovoltaic energy source, having comparable high efficiency to commercialised silicon solar cells.1 Moreover, they are prone to be deposited on variable substrates using cost-effective techniques likewise roll-to-roll processing.2 At this point, considering the toxicity of the lead counterparts used will be a critical step in overcoming the commercialization challenge, especially for market niches such as wearable photovoltaics. Tin-based perovskites have gained considerable attention owing to having similar optoelectronic properties to lead-based counterparts such as high charge carrier mobility, small exciton binding energy, and a bandgap close to the ideal value which guarantees a PCE approaching 15%.3,4 However, Sn2+ quickly oxidizes to Sn4+ in the presence of oxygen or even with a mildly oxidative solvent system,5 limiting their performance in PSCs. Here, we discuss the advantages of adopting water-free poly(3,4-ethylenedioxythiophene (PEDOT) formulation in hybrid metal-organic tin-based PSCs. We effectively alternated the surface energy of the water-free PEDOT to form a high-quality perovskite film over macroscopic areas. Moreover, we performed a careful perovskite optimization to achieve a power conversion efficiency above 7% for tin-based perovskite solar cells with a DMSO-free solvent system and good operational stability. 1. National Renewable Energy Laboratory. PV Efficiency Chart. https://www.nrel.gov/pv/cell-efficiency.html (2022). 2. Nat. Commun. 11, 1–11, (2020). 3. Energy Environ. Sci. 14, 1286–1325, (2021). 4. J. Am. Chem. Soc. 143, 10970–10976, (2021). 5. Mater. Adv. 1, 1066–1070, (2020).