Journal
ACS ENERGY LETTERS
Volume 4, Issue 5, Pages 1004-1011Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00323
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Funding
- Applied Materials U.S. [16AMAT004]
- National Centre for Photovoltaic Research and Education (NCPRE)
- UKRI Global Challenge Research Fund project, SUNRISE [EP/P032591/1]
- JC Bose National Fellowship
- Sheikh Saqr fellowship
- IKST, Bangalore
- SERB, DST (Govt. of India)
- CII
- Department of Atomic Energy (Govt. of India)
- EPSRC [EP/P032591/1] Funding Source: UKRI
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In this work, we report a lead-free hybrid halide perovskite system with a very high piezoelectric charge density for applications in nanogenerators. We use materials engineering by incorporation of formamidinium tin iodide, FASnI(3), in a soft polymer (polyvinylidene fluoride, PVDF) matrix and demonstrate high-performance large-area flexible piezoelectric nanogenerators. This is achieved by using self-poled thin films of a FASnI(3):PVDF nano-composite. The fabricated devices show an output voltage up to similar to 23 V and power density of 35.05 mW cm(-2) across a 1 M Omega resistor, under a periodic vertical compression, with a release pressure of , similar to 0.1 MPa. Measured values of the local piezoelectric coefficient (d(33)) of these films reach up to 73 pm/V. We provide the microscopic mechanism using first-principles calculations, which suggest that a soft elastic nature and soft polar optic phonons are responsible for the high piezoelectric response of FASnI(3). Our studies open up a route to high-performance organic-inorganic halide perovskite family of materials.
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