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第十届新型太阳能材料科学与技术学术研讨会

作者： Changzeng Ding giulia grancini Chang-Qi Ma School of Nano-Tech and Nano-Bionics University of Science and Technology of China Department of Chemistry & INSTM University of Pavia

Perovskite solar cells(PSCs) longevity is nowadays the bottleneck for their full commercial *** lot of research is ongoing,the initial decay of the output power – an effect known as "burn-in" degradation happening in the first hundred hours–is still unavoidable,significantly reducing the overall performance(typically of more than 20%).In this paper,we demonstrate the origin of the "burn-in" degradation in n-i-p type PSCs which is directly related to Li+ ions migration coming from the SnO2 electron transporting layer visualize by time-of-flight secondary ion mass spectrometry(TOF-SIMS) *** block the ion movement,we introduced a thin crosslinked PC61BM(CLPCBM) layer on top of the SnO2 layer,resulting in Li+ *** resulted in the elimination of the "burn-in" degradation,showing for the first time a zero "burn-in" loss in the performances while boosting device power conversion efficiency(PCE) to>22% for triple-cation based PSCs and > 24% for formamidinium-based(FAPbI3) PSCs,proving the general validity of our approach and creating a new framework for the realization of stable PSCs devices.

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High-Sensitivity Visualization of Ulitrafast Carrier Diffusion by Wide-Field Holographic Microscopy

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Ultrafast Science 2023年第5期3卷 43-49页

作者： Martin Hörmann Federico Visentin Andrea Zanetta Johann Osmond giulia grancini Niek Fvan Hulst Matz Liebel Giulio Cerullo Franco V.A.Camargo Dipartimento di Fisica Politecnico di MilanoPiazza L.da Vinci 3220133 MilanoItaly Department of Chemistry and INSTM University of PaviaVia T.Taramelli 1427100 PaviaItaly ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology08860 CastelldefelsBarcelonaSpain ICREA-InstitucióCatalana de Recerca i Estudis Avançats Passeig Lluís Companys 2308010 BarcelonaSpain IFN-CNR Piazza L.da Vinci 3220133 MilanoItaly.

Ultrafast transient microscopy is a key tool to study the photophysical properties of materials in space and time,but current implementations are limited to≈1-μm fields of view,offering no statistical information for heterogeneous ***,we demonstrated wide-field transient imaging based on multiplexed off-axis ***,we perform ultrafast microscopy in parallel around a hundred diffraction-limited excitation spots over a≈60-μm field of view,which not only automatically samples the photophysical heterogeneity of the sample over a large area but can also be used to obtain a 10-fold increase in signal-tonoise ratio by computing an average *** apply our microscope to study the carrier diffusion processes in methylammonium lead bromide *** observe strong diffusion due to the presence of hot carriers during the first picosecond and slower diffusion *** also describe how many-body kinetics can be misleadingly interpreted as strong diffusion at high excitation densities,while at weak excitation,real diffusion is ***,the vast increase in sensitivity offered by this technique benefits the study of carrier transport not only by reducing data acquisition times but also by enabling the measurement of the much smaller signals generated at low carrier densities.

关键词： diffusion excitation transient

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