Harvesting environmental energy to generate electricity is a key scientific and technological endeavour of our time. Photovoltaic conversion and electromechanical transduction are two common energy-harvesting mechanisms based on, respectively, semiconducting junctions and piezoelectric insulators. However, the different material families on which these transduction phenomena are based complicate their integration into single devices. Here we demonstrate that halide perovskites, a family of highly efficient photovoltaic materials1,2,3, display a photoflexoelectric effect whereby, under a combination of illumination and oscillation driven by a piezoelectric actuator, they generate orders of magnitude higher flexoelectricity than in the dark. We also show that photoflexoelectricity is not exclusive to halides but a general property of semiconductors that potentially enables simultaneous electromechanical and photovoltaic transduction and harvesting in unison from multiple energy inputs.
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The data represented in Figs. 1, 2c,d, 3 and 4 are provided with the paper as source data. Other datasets generated and/or analysed during the current study are available from L.S. on reasonable request.
Kojima, A. et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J. Am. Chem. Soc. 131, 6050–6051 (2009).
Burschka, J. et al. Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature 499, 316–319 (2013).
Li, W. et al. Chemically diverse and multifunctional hybrid organic–inorganic perovskites. Nat. Rev. Mater. 2, 16099 (2017).
Kogan, S. M. Piezoelectric effect during inhomogeneous deformation and acoustic scattering of carriers in crystals. Sov. Phys. Solid State 5, 2069–2070 (1964).
Bursian, E. & Zaikovskii, O. I. Changes in curvature of ferroelectric film due to polarization. Sov. Phys. Solid State 10, 1121–1124 (1968).
Tagantsev, A. K. Piezoelectricity and flexoelectricity in crystalline dielectrics. Phys. Rev. B 34, 5883–5889 (1986).
Zubko, P., Catalan, G. & Tagantsev, A. K. Flexoelectric effect in solids. Annu. Rev. Mater. Res. 43, 387–421 (2013).
Majdoub, M. S., Sharma, P. & Cagin, T. Enhanced size-dependent piezoelectricity and elasticity in nanostructures due to the flexoelectric effect. Phys. Rev. B 77, 125424 (2008).
Lee, D. et al. Giant flexoelectric effect in ferroelectric epitaxial thin films. Phys. Rev. Lett. 107, 057602 (2011).
Lu, H. et al. Mechanical writing of ferroelectric polarization. Science 336, 59–61 (2012).
Bhaskar, U. K. et al. A flexoelectric microelectromechanical system on silicon. Nat. Nanotechnol. 11, 263–266 (2016).
Narvaez, J., Vasquez-Sancho, F. & Catalan, G. Enhanced flexoelectric-like response in oxide semiconductors. Nature 538, 219–221 (2016).
Yang, M.-M., Kim, D. J. & Alexe, M. Flexo-photovoltaic effect. Science 360, 904–907 (2018).
Nie, W. et al. Light-activated photocurrent degradation and self-healing in perovskite solar cells. Nat. Commun. 7, 11574 (2016).
Rakita, Y. et al. Tetragonal CH3NH3PbI3 is ferroelectric. Proc. Natl Acad. Sci. USA 114, E5504–E5512 (2017).
Liu, Y. et al. Two-inch-sized perovskite CH3NH3PbX3 (X = Cl, Br, I) crystals: growth and characterization. Adv. Mater. 27, 5176–5183 (2015).
Zhu, W., Fu, J. Y., Li, N. & Cross, L. Piezoelectric composite based on the enhanced flexoelectric effects. Appl. Phys. Lett. 89, 192904 (2006).
Stengel, M. Surface control of flexoelectricity. Phys. Rev. B 90, 201112 (2014).
Biancoli, A., Fancher, C. M., Jones, J. L. & Damjanovic, D. Breaking of macroscopic centric symmetry in paraelectric phases of ferroelectric materials and implications for flexoelectricity. Nat. Mater. 14, 224–229 (2015).
Abdollahi, A., Vásquez-Sancho, F. & Catalan, G. Piezoelectric mimicry of flexoelectricity. Phys. Rev. Lett. 121, 205502 (2018).
Wen, X. et al. Flexoelectret: an electret with a tunable flexoelectriclike response. Phys. Rev. Lett. 122, 148001 (2019).
Vales-Castro, P. et al. Flexoelectricity in antiferroelectrics. Appl. Phys. Lett. 113, 132903 (2018).
Xiao, Z. et al. Giant switchable photovoltaic effect in organometal trihalide perovskite devices. Nat. Mater. 14, 193–198 (2015).
Hoke, E. T. et al. Reversible photo-induced trap formation in mixed-halide hybrid perovskites for photovoltaics. Chem. Sci. 6, 613–617 (2015).
Xing, J. et al. Ultrafast ion migration in hybrid perovskite polycrystalline thin films under light and suppression in single crystals. Phys. Chem. Chem. Phys. 18, 30484–30490 (2016).
Juarez-Perez, E. J. et al. Photoinduced giant dielectric constant in lead halide perovskite solar cells. J. Phys. Chem. Lett. 5, 2390–2394 (2014).
Pintilie, L. & Alexe, M. Ferroelectric-like hysteresis loop in nonferroelectric systems. Appl. Phys. Lett. 87, 112903 (2005).
Pierret, R. F. Semiconductor Device Fundamentals 213–214 (Addison-Wesley, 1996).
Liu, Y., Yang, Q., Zhang, Y., Yang, Z. & Wang, Z. L. Nanowire piezo-phototronic photodetector: theory and experimental design. Adv. Mater. 24, 1410–1417 (2012).
Meirzadeh, E. et al. Surface pyroelectricity in cubic SrTiO3. Adv. Mat. 31, 1904733 (2019).
Catalan, G. & Noheda, B. Surface polarization feels the heat. Nature 575, 600–602 (2019).
Marinov, Y. et al. Photoflexoelectric effects in a homeotropic guest-host nematic. Europhys. Lett. 41, 513–518 (1998).
Weddell, A. S. et al. A survey of multi-source energy harvesting systems. In 2013 Design, Automation & Test in Europe Conference & Exhibition (DATE) 905–908 (IEEE, 2013).
This work was supported by the National Natural Science Foundation of China under grant nos. 51962020, 51972157, 11574126 and 11604135, and partly by the National Key Research and Development Plan of China (2017YFB0406300). L.S. and S.K. thank Nanchang University for support. G.C. acknowledges support from the Generalitat de Catalunya (Grant 2017 SGR 579) and from MINECO (National Plan MAT2016-77100-C2-1-P and Severo Ochoa SEV-2017-0706). M.S. acknowledges the support of MINECO through grants no. MAT2016-77100-C2-2-P and no. SEV-2015-0496, Generalitat de Catalunya (grant no. 2017 SGR1506) and the European Research Council under the European Union’s Horizon 2020 research and innovation programme (grant no. 724529). We thank D Torres for the graphic design of Fig. 2a,b.
The authors declare no competing interests.
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Shu, L., Ke, S., Fei, L. et al. Photoflexoelectric effect in halide perovskites. Nat. Mater. 19, 605–609 (2020). https://doi.org/10.1038/s41563-020-0659-y
Nature Materials (2021)
Nature Materials (2021)