Polarization imaging in ferroelectric polymer thin film capacitors by pyroelectric scanning microscopy

Abstract

"Polarization imaging in ferroelectric polymer thin film capacitors by pyroelectric scanning microscopy" (2014). Stephen Ducharme Publications. 96.

Multimodal Nonlinear Optical Imaging of MoS2 and MoS2-Based van der Waals Heterostructures

“…53 Photocurrent line mapping was also conducted on the MoS2-graphene heterostructure (VSD = -0.2 V), which was recorded by scanning a focused 405 nm laser beam with a spot size and power of ~ 1 μm and ~ 5 μW (inset in Figure 5j). 55 The strongest photocurrent response was observed in the stacking region (Figure 5k), indicating that spontaneous charge separation occurred at the interface of MoS2 and graphene. 54 The electric and scanning photocurrent measurements therefore further confirmed a strong coupling between the monolayer MoS2 and bilayer graphene.…”

Lateral‐Structure Single‐Crystal Hybrid Perovskite Solar Cells via Piezoelectric Poling

“…[ 38 ] The device was loaded onto a programmable X -Y position stage, and was illuminated by a focused 632 nm laser beam with a focused light spot size of approximately 1 µm on the MSC surface ( Figure 4 a). [ 44 ] laser spot across anode to cathode of the lateral-structure device. There is an increasing photocurrent toward the center, while there is a relatively fl at region of photocurrent generated close to the center, where the photo-generated electrons and holes should be most effi ciently collected by the cathode and anode with a good balance.…”

“…[ 43 ] Photocurrent scanning was conducted on a MAPbI 3 lateralstructure single-crystal device with 70 µm electrodes spacing to evaluate the charge collection length in these single crystals. [ 44 ] The much longer carrier diffusion length of the single crystal principally allows the using of focused laser beam instead of electron beam to locally genera the charges. [ 38 ] The device was loaded onto a programmable X -Y position stage, and was illuminated by a focused 632 nm laser beam with a focused light spot size of approximately 1 µm on the MSC surface ( Figure 4 a).…”

Laser‐Assisted Nanowelding of Graphene to Metals: An Optical Approach toward Ultralow Contact Resistance

“…Scanning Photocurrent Microscopy : The sample was illuminated by a 1 mW blue diode laser beam (λ = 405 nm, fluence = 1.6 × 10 3 J cm −2 ) modulated by a chopper at 40 Hz to reduce the thermal effect of the laser on the sample. The laser beam was tightly focused into a 1 µm spot size to enhance the spatial resolution . The photocurrent was collected with an SR830 lock‐in amplifier at each scanning step with the chopper frequency as a reference.…”