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Current issue

ELEKTRO 1/2018 was released on January 16th 2018. Its digital version will be available on February 12th 2018.

Topic: Electrotechnology; Materials for electrical engineering; Wiring material

Main Article
A new electrical insulating fluid and its possible deployment in practice

SVĚTLO (Light) 6/2017 was released on December 11th 2017. Its digital version will be available on january 11th 2018.

Lighting installations
The lighting of university building Centrale Supélec in Saclay in France
The light for our future

Daylight
Application and judgment light guides Solatube®

Mystery that was holding back development of next-generation solar cells solved

30.12.2016 | Imperial College London | www.imperial.ac.uk

Scientists have identified an unexpected cause of poor performance in a new class of flexible and cheap solar cells, bringing them closer to market.

In the new study, scientists looked at solar cells made from materials known as perovskites. These can be produced cheaply from chemicals mixed into printable or sprayable ink, which then crystallises to form light-absorbing films.

Solving the mystery of perovskite solar cells

However, perovskite films contain charged defects that are likely to impair their performance. Slow movement of these defects is thought to be responsible for a process known as hysteresis, which leads to irregularities in the efficiency with which light is converted to electrical current.

Now researchers from Imperial College London and collaborators have developed new experiments to follow which direction electrons move in the solar cell when they are generated with a short pulse of light. They found that the mobile charged defects are still present even in solar cells with very efficient contact materials, despite these cells showing no hysteresis. Hysteresis was only found when cells suffered the combined effects of both the defects and poor selectivity at the contacts.

Read more at Imperial College London

Image Credit: Imperial College London

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