Solar-Cell Efficiency

Introduction

An innovative way of manufacturing solar cells that can convert light into electricity with an energy conversion efficiency of more than 20%, has been developed by Mitsubishi. It is believed to be the highest ever conversion ratio achieved by a domestic product. The Tokyo-based company achieved this by using a newly developed anti-reflection layer that keeps light trapped inside the solar cell. Composed of nitride, the layer is only 0.08 micron thick but has twice the refractive index of the normal atmosphere. When the light transmitted through this layer reflects off the solar cell electrodes, it bounces back down from this layer and remains trapped. Mitsubishi increased the total electrode surface area was by placing the electrodes closer together. The combined effect has raised the electricity-generating capacity per unit area of the solar cell and boosted its energy efficiency above 20%.

The company already holds the fourth-largest share of the domestic market for solar cells. Most of the commercially available solar cells have an efficiency of around 15%. With its higher efficiency, and better economic performance, the new solar cells should be more attractive to the consumers. Mitsubishi thus intends to double its production of solar cells and try to overtake Sanyo.

Main Application

Energy

For further information please contact

Science & Technology Wing Embassy of India
2-2-11, Kudan Minami, Chiyoda-ku
Tokyo 102-0074, Japan
Tel: +81-3-3262-2391 to 97,
Fax: +81-3-3234-4866
E-mail: tandonus@hotmail.com