This work is led by Prof. Qingbo Meng, Prof. Dongmei Li (Institute of Physics, the Chinese Academy of Sciences) and Dr. Hongshi Li (Nankai University). Interfacial stability and open-circuit voltage of perovskite solar cells have been mainly limited by defect states in perovskite films.
Here, aiming at outstanding interfacial passivation, Prof. Meng’s team have investigated the reconfiguration of perovskite interface by the interaction between a series of quaternary ammonium bromides (QAB) and lead-halide (Pb-X) octahedrons. Bromide-iodide substitution reaction or R4NBr addition reaction may occur on the perovskite surface, which is related to the steric hindrance of quaternary ammonium cations.
On this basis, the perovskite surface morphology, band structure, growth orientation and defect states are reconstructed via the R4NBr addition reaction. This ordered lead-halide adduct could effectively repair the imperfect perovskite/hole transportation layer interface to suppress non-radiative recombination and ion migration for ultralong carrier lifetime over 10 us.
The resulting perovskite solar cells yield the 23.89% efficiency with a steady-state efficiency of 23.70%. Besides, the passivated cells can sustain 86% of initial efficiency after 200-h operation.
This work provides an avenue for reconfiguring perovskite surface by QABs. More interestingly, a sticky solid material based on this Pb-X adduct has further used to encapsulate photoelectronic devices, which can retain its initial performance even after being placed in water for a period of time.
Research Report:Reconfiguring perovskite interface via R4NBr addition reaction toward efficient and stable FAPbI3-based solar cells
Related Links
Institute of Physics, Chinese Academy of Sciences
All About Solar Energy at SolarDaily.com
|
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook – our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don’t have a paywall – with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution. |
||
|
SpaceDaily Contributor $5 Billed Once credit card or paypal |
 |
SpaceDaily Monthly Supporter $5 Billed Monthly paypal only |
NREL creates highest efficiency 1-sun solar cell
Golden CO (SPX) May 27, 2022
Researchers at the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) created a solar cell with a record 39.5% efficiency under 1-sun global illumination. This is the highest efficiency solar cell of any type, measured using standard 1-sun conditions.
“The new cell is more efficient and has a simpler design that may be useful for a variety of new applications, such as highly area-constrained applications or low-radiation space applications,” said Myles Steiner, a senior scient … read more