| 초록 |
We report the reduced-dimensionality perovskite films that exhibit improved stability in solar cell performance while retaining the high performance of conventional three-dimensional perovskites. We achieve the first certified hysteresis-free solar power conversion in a planar perovskite solar cell, obtaining a 15.3% PCE, and observe greatly improved performance longevity. We also report a perovskite mixed material, comprised of a series of differently quantum-size-tuned grains, that funnels photoexcitations to the lowest-bandgap light-emitter in the mixture. The materials function as charge carrier concentrators, ensuring that radiative recombination successfully outcompetes trapping and hence nonradiative recombination. We use the new material to build devices that exhibit an external quantum efficiency of 8.8% and a radiance of 80 Wsr-1m-2. These represent the brightest and most efficient solution-processed near-infrared LEDs to date. |
