On the Origin of Below-Bandgap Turn-On Voltage in LEDs and High VOC in Solar Cells comprising Colloidal Quantum Dots with Engineered Density of States

TL;DR

This paper investigates the fundamental reasons behind the low turn-on voltage in colloidal quantum dot LEDs and the high open-circuit voltage in related solar cells, focusing on engineered density of states.

Contribution

It introduces a novel understanding of how engineered density of states affects device performance, providing insights into optimizing quantum dot optoelectronic devices.

Findings

Engineered density of states reduces below-bandgap turn-on voltage in LEDs.

High VOC in quantum dot solar cells is linked to density of states manipulation.

The study offers design principles for low-power LEDs and high-efficiency solar cells.

Abstract

The turn-on voltage of an LED is an important parameter as it determined the power consumption of the LED and influences the effective power conversion efficiency.