A research team at the School of Engineering of the Hong Kong University of Science and Technology (HKUST) have revealed the existence of surface concavities on individual crystal grains of perovskite thin films while unraveling their effects on the film’s properties and reliability.
To address issues surrounding the long-term stability of perovskite devices under light, humidity and thermomechanical conditions, the group conducted research focused on the materials’ microstructure. They discovered a proliferation of surface concavities at the crystalline grains of the perovskite material, shown to break the structural continuity at the perovskite film interface.
The team concluded that the broken structural continuity serves as a hidden microstructure factor limiting the efficiency and stability of perovskite cells. Based on this discovery, the team says it has pioneered a way of making these cells more efficient and stable via a chemo-elimination of these grain surface concavities.
“Structure and geometry of individual crystalline grains are the origin of the performance of perovskite semiconductors and solar cells,: says HKUST’s Prof. Zhou Yuanyuan, the corresponding author of the work.
“By unveiling the grain surface concavities, understanding their effects and leveraging chemical engineering to tailor their geometry, we are pioneering a new way of making perovskite solar cells with efficiency and stability toward their limits.”
The team’s research work, a collaboration with Hong Kong Baptist University and Yale University, is entitled “Elimination of Grain Surface Concavities for Improved Perovskite Thin-Film Interfaces. It was published in the journal Nature Energy.
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HKUST Engineering Researchers Increase Perovskite Solar Cell Reliability
Seminal astrophysicist Carl Sagan explains why uncomfortable ideas may be banned in religion, they must not be shunned in science.
This is an important concept in American life today, as conspiracy theorists are convinced that climate change denial cannot be considered in scientific circles.
I happened to bring this up in my interview with Dr. V. Ramanathan of the Scripps Institution, who has been amassing data on global warming since the 1970s. He laughed, and explained, “If I could prove that human activity was not causing temperatures to rise, I’d be be one of the wealthiest and most famous scientists in world history.”
As suggested at left, a great deal of the hardship that has befallen the U.S. was simply bad luck. Al Gore came within a whisker of victory in 2000, a win that would have forever changed the course of our nation in terms of energy policy, education, healthcare, and international affairs.
If Bernie had become the 2016 nominee, we wouldn’t have had Hillary Clinton telling our country’s most mean-spirited and least-educated people that they were “deplorables,” ushering a criminal sociopath into the White House.
We Came Incredible Close to Averting the Disaster that Is Donald Trump
Social democracies are nations in which the tax base provides everyone with healthcare and education, and where the richest and most powerful people are not free to ruin the environment.
I run into someone from one of these counties a couple of times a month, and I like to ask why their people are consistently at the top of the World Happiness Rankings. The normal response is always some variant of the following:
It’s hard to be happy living in a society that is indifferent to the suffering of others. It’s part of the very nature of human beings to care about one another.
Something else I notice about these places is that very few people are religious. Sweden, e.g., is about 80% atheist.
That means no childish tribalism, no ridiculous dogmas, no worries about eternal damnation, etc.
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