Oriented naphthalene-O-propylammonium-based (NOP)4AuBIIII8 (B = Au, Bi, Sb) Ruddlesden–Popper two-dimensional gold double perovskite thin films featuring high charge-carrier mobility

Journal article

Two-dimensional perovskites show intriguing optoelectronic properties due to their anisotropic structure and multiple quantum well structure. Here, we report the first three gold-based Ruddlesden–Popper type two-dimensional double perovskites with a general formula (NOP)4AuIBIIII8 (B = Au, Bi, Sb) employing naphthalene-O-propylammonium (NOP) as an organic cation. They were found to form highly crystalline thin films on various substrates, predominantly oriented in the [001] direction featuring continuous, crack-free film areas on the μm2 scale. The thin films show strong optical absorption in the visible region, with band gap energies between 1.48 and 2.32 eV. Density functional theory calculations support the experimentally obtained band gap energies and predict high charge-carrier mobilities and effective charge separation. A comprehensive study with time-resolved microwave conductivity (TRMC) and optical-pump-THz-probe (OPTP) spectroscopy revealed high charge-carrier mobilities for lead-free two-dimensional perovskites of 4.0 ± 0.2 cm2(V s)−1 and charge-carrier lifetimes in the range of μs. Photoconductivity measurements under 1 sun illumination demonstrated the material’s application as a photodetector, showing a 2-fold increase in conductivity when exposed to light.

Authors: Wolf, F; Chau, T; Han, D; Spooner, KB; Righetto, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Chemical Society
• Journal: Journal of the American Chemical Society
• Volume: 147
• Issue: 20
• Pages: 16992-17001
• Place of publication: United States
• Publication date: 2025-05-09
• Acceptance date: 2025-04-16
• DOI: 10.1021/jacs.5c01102
• EISSN: 1520-5126
• ISSN: 0002-7863
• Pmid: 40343735
• Language: English