The Discovery paved the way for a new generation of solar cells

Solar photovoltaic (pv) net news: a study led by the KU Leuven first explains for the first time a promising perovskite - Artificial crystal can convert sunlight into electricity - How to stabilize. As a result, the crystal black, allowing them to absorb sunlight. That can be easy to manufacture and efficient new solar panels, it is necessary to use them. The study is published in & other; Science & throughout; The magazine.

perovskite semiconductor materials have many applications. They showed a special harvest solar energy. Currently, most solar cells made from silicon, silicon is a relatively simple and effective material, can be used for this purpose. However, on the basis of perovskite devices provide higher conversion efficiency than silicon. The only problem is: some of the most promising perovskite, namely triiodide lead ( CsPbI 3) , very unstable at room temperature. Under these conditions, they have the yellow, because the atoms in the crystal is not formed perovskite structure. In order to make the crystal absorb sunlight and convert it into electricity effectively, they should be in black perovskite state, and maintain this state.

　　“ Crystal silicon to form a very strong rigidity. If we press it, it will not change its shape. The perovskite, on the other hand, is more soft, more malleable, & throughout; KU leuven, the center of the membrane Julian explained Dr Steele. Sustainable solution separation, adsorption, catalysis and spectroscopy ( cMACS) 。 “ We can have a variety of laboratory conditions stable them, but at room temperature, black perovskite atoms do need to reshuffle, change the structure, will eventually crystals become yellow. ”

Steele, together with the international team of scientists found that by putting a perovskite of thin film solar cell adhesion on a piece of glass, cells can obtain and maintain the status of the black. Add film heated to 330 degrees Celsius, the temperature of the perovskite expansion and adhesive on the glass. After heating, the film fast cooling to room temperature. This fixed atoms in the crystal process, restrict their movement, keep them the black shape.

　　“ There are three pillars decided the quality of the solar cell: price, stability and performance. Perovskite, however, scores well in terms of performance and price, but their stability is still a major problem, & throughout; Steele said. In recent years, scientists have observed perovskite can keep blackness after heating, but it is not clear why. “ In our study, we chose CsPbI 3, because of its performance is very high, & throughout; Steel explained. “ In addition, it is one of the most unstable perovskite type, which means that it is sensitive to we describe methods, should be converted into other unstable perovskite. ”

most of the data used in this study were collected at the European synchrotron radiation device. In order to understand the molecular scale experimental observation, Ghent university molecular simulation center ( CMM) Colleagues by theoretical simulation of the perovskite phase to support a finding that black and yellow. Calculation results for rationalization to fix and black on the glass substrate as a thin film of stability is necessary.

despite the assumption, but how to fully remains a mystery. “ Normally, we will choose the microscope with atomic resolution and directly have a look. However, it is impossible for the perovskite, because they are hard to use this kind of high resolution imaging instrument observation, because they are very soft and easy separation of below. Ordinary probe energy is relatively high. “

　　“ To understand how this mechanism works will help to further study, eventually developed using pure perovskite crystal solar panels, & throughout; Steele said. “ Due to the processing of solar cells based on perovskite entry level is relatively low, so to operate in a more limited infrastructure for people in developing countries, they are very good. ” In addition, the perovskite can be used for the LED, photoelectric sensors, transistor, X-ray detector, etc.

when the year now, in addition to review the past also need to look to the future, the core content of this article is for the upcoming 2019 photovoltaic industry an outlook, hope it will be a future can be regarded as & other; Review & throughout; Outlook, but I dare not expect, insight into the future is a matter of how difficult, I affirmatively next time to still can accurate judgment, I can guarantee is: I today's word is deliberate temper, is to write down the real thinking by heart. Well, friends, please with a critical eye began to us in 2019, the prospect of the photovoltaic industry.

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