In the past few years, a well-known material called methylammoinum lead triiodide has suddenly become exceptionally popular in photovoltaic community. Specially, the power conversion efficiency of perovskite solar cells (PSCs) has dramatically increased
from reported 3.8% to certified 20.1% in just five years through low-cost manufacturing procedures. To date, the popularity of the hybrid perovskite shows no sign of abating. Perovskite has worked wonders shown unprecedented steep performance curve
in photovoltaics, and we need to know why.
Aimed for better understanding on the ultimate superiority of perovskite materials, we successfully made centimeter-scale organolead trihalide perovskite single crystals with exceptionally low trap-state density for accurate determination of the material’s intrinsic optical and electrical properties. Both CH3NH3PbBr3 and CH3NH3PbI3 single crystals demonstrated exceptionally long diffusion length exceeding 10 micrometers as calculated from the measured PL lifetime and carrier mobility. This study, as published in Science, demonstrates that PSCs stand to see further breakthroughs through substantial improvement in the crystallinity in perovskite layer.
We are currently interested in deep investigation on the fundamental aspects of perovskite materials and the working mechanism of PSCs, specifically from photo- and electrical-physical perspective angles. We also seek to develop cost-effective device engineering protocols and other application of perovskites.
We are all enthusiastic. Come and join us, and enjoy the perovskite fever.
Dong Shi, Valerio Adinolfi, Riccardo Comin, Mingjian Yuan, ErkkiAlarousu, Andrei Buin, Yin Chen, SjoerdHoogland, Alexander Rothenberger,KhabiboulakhKatsiev, YaroslavLosovyj, Xin Zhang, Peter A. Dowben, Omar F. Mohammed, Edward H. Sargent, Osman M. Bakr*, Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystals, Science 347, no. 6221 (2015): 519-522.
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