Defect-Assisted Photoinduced Halide Segregation in Mixed-Halide Perovskite Thin Films
Alex J. Barker,Aditya Sadhanala,Felix Deschler,Marina Gandini,Satyaprasad P. Senanayak,Phoebe Pearce,Edoardo Mosconi,Andrew J. Pearson,Yue Wu,Ajay Ram Srimath Kandada,Tomas Leijtens,Filippo De Angelis,Siân E. Dutton,Annamaria Petrozza,Richard H. Friend +14 more
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TLDR
In this paper, it was shown that ion segregation takes place via halide defects, resulting in iodide-rich lowbandgap regions close to the illuminated surface of the film, driven by the strong gradient in carrier generation rate through the thickness of these strongly absorbing materials.Abstract:
Solution-processable metal halide perovskites show immense promise for use in photovoltaics and other optoelectronic applications. The ability to tune their bandgap by alloying various halide anions (for example, in CH3NH3Pb(I1–xBrx)3, 0 < x < 1) is however hampered by the reversible photoinduced formation of sub-bandgap emissive states. We find that ion segregation takes place via halide defects, resulting in iodide-rich low-bandgap regions close to the illuminated surface of the film. This segregation may be driven by the strong gradient in carrier generation rate through the thickness of these strongly absorbing materials. Once returned to the dark, entropically driven intermixing of halides returns the system to a homogeneous condition. We present approaches to suppress this process by controlling either the internal light distribution or the defect density within the film. These results are relevant to stability in both single- and mixed-halide perovskites, leading the way toward tunable and stable p...read more
Citations
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Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals
Quinten A. Akkerman,Quinten A. Akkerman,Gabriele Rainò,Gabriele Rainò,Maksym V. Kovalenko,Maksym V. Kovalenko,Liberato Manna,Liberato Manna +7 more
TL;DR: Lead-halide perovskites have entered the family of colloidal nanocrystals, showing excellent optical properties and easy synthesizability, and insight is provided into their chemical versatility, stability challenges and use in optoelectronics.
Journal ArticleDOI
Maximizing and stabilizing luminescence from halide perovskites with potassium passivation
Mojtaba Abdi-Jalebi,Zahra Andaji-Garmaroudi,Stefania Cacovich,Camille Stavrakas,Bertrand Philippe,Johannes M. Richter,Mejd Alsari,Edward P. Booker,Eline M. Hutter,Andrew J. Pearson,Samuele Lilliu,Tom J. Savenije,Håkan Rensmo,Giorgio Divitini,Caterina Ducati,Richard H. Friend,Samuel D. Stranks +16 more
TL;DR: This work demonstrates substantial mitigation of both non-radiative losses and photoinduced ion migration in perovskite films and interfaces by decorating the surfaces and grain boundaries with passivating potassium halide layers, and demonstrates the inhibition of transient photo induced ion-migration processes across a wide range of mixed halide perovSKite bandgaps in materials that exhibit bandgap instabilities when unpassivated.
Journal ArticleDOI
Understanding Degradation Mechanisms and Improving Stability of Perovskite Photovoltaics.
Caleb C. Boyd,Rongrong Cheacharoen,Rongrong Cheacharoen,Tomas Leijtens,Tomas Leijtens,Michael D. McGehee,Michael D. McGehee +6 more
TL;DR: Recommendations are made on how accelerated testing should be performed to rapidly develop solar cells that are both extraordinarily efficient and stable.
Journal ArticleDOI
Triple-halide wide–band gap perovskites with suppressed phase segregation for efficient tandems
Jixian Xu,Jixian Xu,Jixian Xu,Caleb C. Boyd,Caleb C. Boyd,Zhengshan J. Yu,Axel F. Palmstrom,Daniel J. Witter,Daniel J. Witter,Bryon W. Larson,Jérémie Werner,Jérémie Werner,Steven P. Harvey,Eli J. Wolf,Eli J. Wolf,William Weigand,Salman Manzoor,Maikel F.A.M. van Hest,Joseph J. Berry,Joseph M. Luther,Zachary C. Holman,Michael D. McGehee,Michael D. McGehee +22 more
TL;DR: A method for incorporating chloride is reported that allows for fabrication of stable triple-halide perovskites with a band gap of 1.67 electron volts and a factor of 2 increase in photocarrier lifetime and charge-carrier mobility that resulted from enhancing the solubility of chlorine by replacing some of the iodine with bromine to shrink the lattice parameter.
Journal ArticleDOI
Stabilizing halide perovskite surfaces for solar cell operation with wide-bandgap lead oxysalts.
Shuang Yang,Shuang Yang,Shangshang Chen,Edoardo Mosconi,Yanjun Fang,Yanjun Fang,Xun Xiao,Congcong Wang,Yu Zhou,Zhenhua Yu,Jingjing Zhao,Jingjing Zhao,Yongli Gao,Filippo De Angelis,Filippo De Angelis,Jinsong Huang,Jinsong Huang +16 more
TL;DR: Th Thin lead oxysalt layers passivate hybrid perovskite surfaces under an ambient atmosphere and enhance solar cell efficiency and formation of the lead oxYSalt layer increases the carrier recombination lifetime and boosts the efficiency of the solar cells to 21.1%.
References
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Journal ArticleDOI
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