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Hybrid metal halide perovskites have been paid enormous attentions in photophysics research, whose excellent performances were attributed to their intriguing charge carriers proprieties. However, it still remains far from satisfaction in the comprehensive understanding of perovskite charge-transport properities, especially about trap-assisted recombination process. In this Letter, through time-resolved transient absorption (TA) and photoluminescence (PL) measurements, we provided a relative comprehensive investigation on the charge carriers recombination dynamics of CH3NH3PbBr3 (MAPbBr3) perovskite films and quantum dots (QDs), especially about trap-assisted recombination. It was found that the integral recombination mode of MAPbBr3 films was highly sensitive to the density distribution of generated charge carriers and trap states. Additional, Trap effects would be gradually weakened with elevated carrier densities. Furthermore, the trap-assisted recombination can be removed from MAPbBr3 QDs through its own surface passivation mechanism and this specialty may render the QDs as a new material in illuminating research. This work provides deeper physical insights into the dynamics processes of MAPbBr3 materials and paves a way toward more light-harvesting applications in future.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4888750 | PMC |
http://dx.doi.org/10.1038/srep27286 | DOI Listing |
Adv Sci (Weinh)
December 2024
Faculty of Metallurgical and Energy Engineering/Yunnan Key Laboratory of Clean Energy and Energy Storage, Kunming University of Science and Technology, Kunming, 650093, P. R. China.
Perovskite solar cells (PSCs) are an ideal candidate for next-generation photovoltaic applications but face many challenges for their wider application, including uncontrolled fast crystallization, trap-assisted nonradiative recombination, and inefficient charge transport. Herein, a multistage regulation (MSR) strategy for addressing these challenges is proposed via the introduction of fluorine-rich small molecules with multiple active points (i.e.
View Article and Find Full Text PDFJ Phys Chem Lett
December 2024
Key Laboratory of Flexible Electronics (KLOFE), School of Flexible Electronics (Future Technologies) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
Achieving deep-blue emission is crucial for the practical application of perovskite light-emitting diodes (LEDs) in displays. Increasing the ratio of chlorine to bromine in the perovskite is a facile method to achieve deep-blue emission. However, the low solubility of chloride in the perovskite precursor solution and the low formation energy of defects present challenges that limit device efficiency.
View Article and Find Full Text PDFNanomicro Lett
November 2024
Center On Nanoenergy Research, Institute of Science and Technology for Carbon Peak & Neutrality, School of Physical Science & Technology, Guangxi University, Nanning, 530004, People's Republic of China.
Trap-assisted charge recombination is one of the primary limitations of restricting the performance of organic solar cells. However, effectively reducing the presence of traps in the photoactive layer remains challenging. Herein, wide bandgap polymer donor PTzBI-dF is demonstrated as an effective modulator for enhancing the crystallinity of the bulk heterojunction active layers composed of D18 derivatives blended with Y6, leading to dense and ordered molecular packings, and thus, improves photoluminescence quenching properties.
View Article and Find Full Text PDFAdv Mater
November 2024
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, P. R. China.
Organic ammonium salts are extensively utilized for passivating surface defects in perovskite films to mitigate trap-assisted nonradiative recombination. However, the influence of alkyl chain length on the molecular orientation and spatial steric hindrance of ammonium salt remains underexplored, hindering advancements in more effective passivators. Here, a series of organic ammonium salts is reported with varying alkyl chain lengths to passivate surface defects and optimize band alignment.
View Article and Find Full Text PDFACS Appl Energy Mater
November 2024
Department of Materials, University of Manchester, Engineering Building A, Manchester M1 7HL, U.K.
Perovskite solar cells (PSCs) offer a potentially large-scale method for producing low-cost renewable energy. However, stability challenges currently limit their practical application. Consequently, alternative methods for increasing the PSC stability are urgently needed.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!