Pyroelectric electron emission from nanometer-thick films of PbZrxTi1-xO3

Fletcher, Patrick C.; Mangalam, Vengadesh Kumara R.; Martin, Lane W.; King, William P.
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p192908
Academic Journal
We report pyroelectric emission from PbZrxTi1-xO3 (PZT) thin films on nanometer-sharp tips. The epitaxial PZT films are 30 nm thick and grown directly on single-crystal silicon tips. Pyroelectric emission occurs for heating rates of ≥50 °C/min in a 20 V/μm external field. The emission current is a maximum of 240 nA when the heating rate is 100 °C/min and the electric field strength is ≥6.7 V/μm. The emitted charge is ∼7% of that expected for a perfect thin film emitter of epitaxial PbZrxTi1-xO3. We calculate that pyroelectric emission can occur without an applied field if the heating rate exceeds 4.0 × 107 °C/min.


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