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Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

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Related Experiment Video

Updated: Jun 17, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Stable Red-Emission Mixed Halide CsPb(Br/I)₃ Perovskite Quantum Dots for LEDs.

Shengnan Tian¹, Jia Wang², Liang Zhao²

¹School of Photoelectric Engineering, Changzhou Institute of Technology, Changzhou 213032, China.

Inorganic Chemistry

|October 29, 2025

Summary

Bromotrimethylsilane (TMSBr) post-treatment significantly boosts the photoluminescence quantum yield and stability of red-emitting perovskite quantum dots (PeQDs). This enhances their potential for advanced white light-emitting diodes (LEDs).

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Area of Science:

Materials Science
Quantum Dot Technology
Photonic Devices

Background:

Red-emission mixed-halide CsPb(Br/I)3 perovskite quantum dots (PeQDs) offer tunable optical properties and high color purity for light-emitting diodes (LEDs).
Surface defects and environmental sensitivity cause nonradiative recombination, leading to low photoluminescence quantum yield (PLQY) and poor stability, hindering practical applications.

Purpose of the Study:

To address the limitations of CsPb(Br/I)3 PeQDs by improving PLQY and environmental stability.
To investigate the efficacy of bromotrimethylsilane (TMSBr) as a passivation agent for post-treatment.

Main Methods:

Post-treatment of CsPb(Br/I)3 PeQDs using bromotrimethylsilane (TMSBr).
Photoluminescence quantum yield (PLQY) measurements.
Environmental stability testing (air, UV, thermal stress).
Density functional theory (DFT) calculations to elucidate passivation mechanisms.

Main Results:

TMSBr treatment significantly enhanced PLQY from 26.6% to 98.1% by suppressing nonradiative recombination.
Improved environmental stability of PeQDs against air, UV radiation, and thermal stress due to hydrophobic TMS groups.
DFT calculations confirmed Br- ions passivate iodide vacancies and TMS groups stabilize undercoordinated I- ions.

Conclusions:

TMSBr is an effective passivation agent for enhancing the performance and stability of CsPb(Br/I)3 PeQDs.
The developed passivation strategy offers a simple and efficient route for high-performance, stable PeQD-based devices.
Fabricated white LEDs demonstrated excellent performance with a high color rendering index (91.6) and luminous efficacy (70.6 lm/W).