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Metal-Semiconductor Junctions

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Updated: May 28, 2026

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Published on: August 23, 2012

Metal Nanoclusters for Interface Engineering and Improved Photovoltaic Performance in Organic Solar Cells.

Yousuf Alishan^1,2, Alvin Joseph¹, Anitha B Pillai¹

¹School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram, Kerala 695551, India.

|December 16, 2024

Summary

Copper nanoclusters (Cu NCs) enhance organic solar cell performance by modifying interfaces. This work function modification reduces energy barriers, improving charge collection and boosting power conversion efficiency in both fullerene and non-fullerene devices.

Keywords:

Cu nanoclusters Metal nanoclusters dipole moment interface engineering organic solar cell

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Last Updated: May 28, 2026

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Published on: July 8, 2016

Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Organic solar cells (OSCs) require efficient charge transport for optimal performance.
Interfacial engineering is crucial for minimizing energy losses and recombination in OSCs.
Copper nanoclusters (Cu NCs) are explored for their potential electronic properties.

Purpose of the Study:

To investigate the use of copper nanoclusters (Cu NCs) as an interfacial modifier in organic solar cells (OSCs).
To evaluate the impact of Cu NCs on the electron transporting layer/active layer interface.
To determine the effect of Cu NCs on the photovoltaic performance of both fullerene and non-fullerene based OSCs.

Main Methods:

One-pot synthesis of copper nanoclusters (Cu NCs).
Theoretical calculations of Cu NC dipole moment and work function modification.
Kelvin probe measurements to observe work function changes.
Fabrication and characterization of OSCs with and without Cu NC interfacial layers.

Main Results:

Cu NCs were synthesized and shown to modify surface work function.
Insertion of Cu NCs improved power conversion efficiency (PCE) in non-fullerene OSCs from 14.22% to 15.83%.
PCE in fullerene-based OSCs increased from 7.79% to 8.62% with Cu NCs.
Interface modification led to reduced recombination losses and charge accumulation.

Conclusions:

Cu NCs effectively engineer the interface in OSCs, enhancing photovoltaic performance.
Work function modification by Cu NCs reduces the energy barrier for charge collection.
Cu NCs offer a promising strategy for improving the efficiency of organic solar cells.