6 papers
Tunable electrocaloric effect in lead scandium tantalate through calcium doping
Youri Nouchokgwe, Natalya S. Fedorova, Pranab Biswas +11
State-of-the-art electrocaloric cooling prototypes rely on the conventional electrocaloric effect of ferroelectric lead scandium tantalate (PbSc0.5Ta0.5O3, PST), which peaks near r…
Solution-Based Fabrication of High-Performance KNaNbO Thin Films for Surface Haptics
Nagamalleswara Rao Alluri, Longfei Song, Stephanie Girod +8
KNaNbO is among the most promising lead-free piezoelectrics. While its sputtered films match the performance of the champion piezoelectric Pb(Zr,Ti)O, repro…
Quantitative correlation between structural (dis-)order and diffuseness of phase transition in lead scandium tantalate
T. Granzow, A. Aravindhan, Y. Nouchokgwe +9
Ferroelectrics show a phase transition to a paraelectric phase at a well-defined transition temperature. Introducing disorder makes this transition diffuse, and the system becomes…
Highly Transparent Lead-Free Piezoelectric Haptic Device
Longfei Song, Sebastjan Glinsek, Nagamalleswara Rao Alluri +6
Acoustic haptic technology adds touch sensations to human-machine interfaces by integrating piezoelectric actuators onto touchscreens. Traditional piezoelectric haptic technologies…
Sub-micron Cu(In,Ga)Se2 solar cell with efficiency of 18.2% enabled by a hole transport layer
Taowen Wang, Longfei Song, Saeed Bayat +6
Reducing the thickness of Cu(In,Ga)Se2 solar cells is a key objective in order to reduce production cost and to improve sustainability. The major challenge for sub-micron Cu(In,Ga)…
Ferroelectric HfO-ZrO multilayers with reduced wake-up
Barnik Mandal, Adrian-Marie Philippe, Nathalie Valle +3
Since the discovery of ferroelectricity in HfO thin films, significant research has focused on Zr-doped HfO and solid solution (Hf,Zr)O thin films. Functional propertie…