High Stress-Driven Voltages in Net-like Layer-Supported Organic-Inorganic Perovskites
Hybrid organo-metal halide perovskites (OMHPs) have been predominantly explored for photo or photo-enhanced applications, which are both time, location or light limited. Unlike in many works, we used methylammonium lead triiodide (MAPbI3) perovskite to fabricate a small area (<1cm2) stress-driven energy converter. Briefly, MAPbI3 was grown on a special net-like composite scaffold, made of three constituents; polyvinylidene fluoride (PVDF), polylactic acid (PLA) and tin (iv) oxide (SnO2) electrospun nanofibres. A systematic vertical ultrasonic vibration was optimized and applied to each sample, followed by ice quenching. Addition of MAPbI3 and vertical vibration altered the morphotropic phase nature of the composite towards desirable electroactive forms, without further poling, revealed by XRD, FTIR, Raman, studies. When the device was subjected to bending/ compression-release forces, high output voltage of 4.82V and current 29.7nA were obtained over an area of 0.0625cm2. The champion device also registered high piezoelectric strain coefficients (d33) of 123.93pCN-1and 118.85pCN-1(with and without an additional SnO2 nanoparticle thin film, respectively). We further elucidate the mechano-electrical outputs of MAPbI3 devices grown on other distinctive underlayers, for the first time. This work advances the drive towards all-day-all-night energy harvesting using OMHPs, the force being applied from ubiquitous motions or artificial movements regardless of the device's photo environment.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry C HOT Papers