Yuav ua li cas los daws qhov teeb meem degradation ntawm perovskite solar cells?

Perovskite solar cells hold promise for improved photoelectric conversion efficiency, but they suffer from one of the biggest drawbacks—their performance degrades over time when exposed to sunlight. A team of scientists from the United States, China and South Korea wrote in the latest issue of "Nature" that they had performed a simple treatment on the surface of perovskite solar cells, solved the problem of degradation, and cleared the way for the application of thin-film solar cell technology. the biggest obstacle.

Perovskites are a group of materials that have the same atomic arrangement (crystal structure) as the mineral perovskite oxides. Metal halide perovskites, one of the "family members", are prepared for their great application potential in the field of high-efficiency and energy-saving thin-film solar cells. attention. Perovskite solar cells are much cheaper to manufacture than silicon-based solar cells, but they have one of the biggest drawbacks – their performance degrades when exposed to light for a long time. If this problem can be properly addressed, it will help solar technology. "Fly into the homes of ordinary people".

Yang Yang, the head of the latest research and a professor of materials science and engineering at the University of California, Los Angeles, explained that for solar cell defects, the common treatment method currently used by scientists is to deposit a layer of organic ions on the surface to make the surface negatively charged. While this treatment was designed to improve the energy-conversion efficiency of perovskite solar cells, it also allowed too many electrons to accumulate on the cell's surface. This destabilizes the orderly arrangement of atoms, making perovskite solar cells less and less efficient over time, ultimately rendering them uncommercial.

Nyob rau hauv lub teeb ntawm qhov kev tshawb pom no, pab neeg nrhiav tau ib txoj hauv kev los daws qhov kev puas tsuaj ntawm lub roj teeb los ntawm kev sib txuas cov ions zoo nrog cov ions tsis zoo rau ntawm qhov chaw, uas ua rau cov hluav taws xob saum npoo av nruab nrab thiab ruaj khov.

Pab neeg no tau kuaj xyuas qhov ua tau zoo ntawm cov hnub ci kho kom zoo nyob rau hauv cov xwm txheej uas ua kom cov cell aging thiab nyob rau hauv cov xwm txheej uas simulate tag nrho - huab cua tshav ntuj. Cov txiaj ntsig tau pom tias cov hlwb tswj tau 87 feem pua ​​​​ntawm lawv qhov kev hloov pauv photoelectric thawj zaug rau ntau tshaj 2,000 teev. Hauv qhov sib piv, nyob rau hauv tib lub sijhawm thiab tib lub sijhawm, kev ua haujlwm ntawm lub hnub ci tsis kho tau poob mus rau 65 feem pua.

"Our perovskite solar cells are among the most stable in efficiency reported to date, and our latest research lays the groundwork for the commercialization and widespread adoption of perovskite solar cell technology," said the researchers. On the basis of further developing and perfecting this technology, we can design more stable perovskite solar cells."