Lead free KNN/P(VDF-TrFE) 0–3 pyroelectric composite films and its infrared sensor

• Published in: Infrared physics & technology Vol. 80; pp. 100 - 104
• Main Authors: Zhang, W.L., Yu, Y.C., Luo, W.B., Shuai, Y., Pan, X.Q., Wu, Q.Q., Wu, C.G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2017
• ISSN: 1350-4495; 1879-0275
• DOI: 10.1016/j.infrared.2016.09.005

•Infrared sensors using lead free KNN/P(VDF-TrFE) composite thick film have fabricated.•The detectivity (D∗) of the sensor was 3.21×108cmHz1/2W−1 at 137.3Hz modulation frequency.•The sensor show high detectivity at high modulation frequency, which makes it a promising candidate for the lead free pyroelectric infrared detector. (K0.5Na0.5)NbO3 (KNN)/[P(VDF-TrFE)70:30] composite thick films with different KNN weight ratios have been fabricated and the effect of KNN mass content on the material structure and properties have been studied in this paper. Properties of the infrared sensor based KNN/[P(VDF-TrFE)70:30] composite thick film were also systematically studied. It was found that the sample containing 30wt.% KNN show optimal properties for pyroelectric appliance and the highest pyroelectric coefficient was 63μCm−2K−1. Infrared sensors using 30wt.% KNN-70wt.%[P(VDF-TrFE)70:30] show highest detectivity (D∗=3.21×108cmHz1/2W−1) at 137.3Hz, indicating it is an promising candidate in lead-free quick response infrared detectors.