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Real-world applications of Moorfield products in science

Enhanced photocurrent Quantum Dot Emission

Publication Title: Enhanced Photocurrent and Electrically Pumped Quantum Dot Emission from Single Plasmonic Nanoantennas
Paper Abstract

Integrating cavity-enhanced colloidal quantum dots (QDs) into photonic chip devices would be transformative for advancing room-temperature optoelectronic and quantum photonic technologies. However, issues with efficiency, stability, and cost remain formidable challenges to reach the single antenna limit. Here, we present a bottom-up approach that delivers single QD-plasmonic nanoantennas with electrical addressability. These QD nanojunctions exhibit robust photoresponse characteristics, with plasmonically enhanced photocurrent spectra matching the QD solution absorption. We demonstrate electroluminescence from individual plasmonic nanoantennas, extending the device lifetime beyond 40 min by utilizing a 3 nm electron-blocking polymer layer. In addition, we reveal a giant voltage-dependent redshift of up to 62 meV due to the quantum-confined Stark effect and determine the exciton polarizability of the CdSe QD monolayer to be 4 × 10–5 meV/(kV/cm)2. These developments provide a foundation for accessing scalable quantum light sources and high-speed, tunable optoelectronic systems operating under ambient conditions.

How Moorfield products helped:

Chromium and Gold electrode deposition by thermal evaporation

Electrical contact devices are fabricated on borosilicate glass substrates (Pi-Kem). (37) A Cr adhesion layer (3 nm) and Au bottom electrode (30 nm) are first deposited on the glass substrate via thermal evaporation at a rate of 0.1 nm/s (NanoPVD-T15A, Moorfield Nanotechnology) through shadow masks (PhotoFab, Alphasol Tec AG).

Open Access publication details:
Huang, J. et al. (2024) ‘Enhanced Photocurrent and Electrically Pumped Quantum Dot Emission from Single Plasmonic Nanoantennas’, ACS Nano, 18(4), pp. 3323–3330. Available at: https://pubs.acs.org/doi/10.1021/acsnano.3c10092