2023年6月7日 · Constructing two-dimensional (2D) perovskite atop of 3D with energy landscape management is still a challenge in perovskite photovoltaics. Here, we report a strategy through designing a series of π-conjugated organic cations to construct stable 2D perovskites and to realize delicate energy level tunability at 2D/3D heterojunctions.

2024年8月15日 · Here we find that mixed Sn–Pb perovskite thin films exhibit a compositional gradient, with an excess of Sn on the surface—and we show this gradient exacerbates oxidation and increases the...

2020年2月5日 · The fundamental principles, alternative operation modes, and development of C-AFM are comprehensively reviewed, and applications in perovskite solar cells (PSCs) for electronic transport behavior, ion migration and hysteresis, ferroelectric polarization, and facet orientation investigation are discussed.

2023年10月1日 · c-AFM is used to investigate the current distribution of pristine perovskite and melanin-perovskite composite according to the conductivity discrepancy. The pristine–perovskite sample exhibits a generally more homogeneous current image than the composite one.

2016年7月4日 · The large surface roughness of the perovskite material, together with strong tip–sample interactions, pose significant challenges for reproducible cAFM using contact mode scanning...

2021年6月10日 · This chapter describe the brief introduction of Kelvin probe force microscopy (KPFM) and conducting atomic force microscopy (CAFM) and their application in electrical characterization at nanoscale of organic and perovskite photovoltaic materials.

2022年11月1日 · The photodegradation of lead iodide (PbI 2) scaffolds methylammonium lead iodide (CH 3 NH 3 PbI 3, MAPI) perovskite under concentrated sunlight was investigated with absorbance, photoluminescence (PL), and conducting atomic force microscopy (CAFM) techniques. At the nanoscale, the CAFM technique provides direct evidence of change in the ...

2024年12月13日 · Kelvin probe force microscopy (KPFM) [6, 13, 14] and conductive atomic force (CAFM) [6, 13, 27] have been employed to describe the local characteristics of thin films of perovskite. Research on rapid degradation at the nanoscale using direct local measurements of perovskite films is scarce.

2024年5月8日 · As a result, perovskite solar cells (PSCs) employing FTPE-ST achieve a champion power conversion efficiency (PCE) of 25.21% with excellent long-time stability, one of the highest PCEs for non-spiro HTMs in n-i-p PSCs.

2024年5月1日 · CAFM images were obtained using the Asylum Research Cypher ES Environmental AFM in the air. The samples for CAFM measurements were prepared on Si/SiO 2 wafers with a Ti/Au electrode as a conductive substrate with an insulating layer. The 2D perovskite crystal was electrically grounded with a conductive sample holder.