Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Recently inorganic-organic hybrid lead halide perovskite has been attracting increasing attention in photovoltaics due to its promising properties such as high absorption over the visible range and long carrier diffusion length. Certified photoconversion efficiencies of perovskite solar cells have been reported over 22%.1 Additionally the application of perovskite derivatives for the development of light emitting devices, as LEDs,2 light amplifiers3 or lasers,4 has already been demonstrated. In parallel colloidal quantum dots (QDs) have emerged as promising building blocks for the application in optoelectronic devices, such as photodetectors, light emitting devices and solar cells, due to their low-cost, high stability, solution process and size-dependent optoelectronic properties.5 The combination of two promising materials, perovskite and QDs, appears as an important parameter for photovoltaic development. Indeed, it has been reported that with the aid of perovskite shell the quality of QDs has been improved significantly such as enhancement of photoelectric properties6 and Auger lifetime in QD solids7. Photoconversion efficiency of quantum dot solar cells based on quantum dots/perovskite core/shell absorbers has been increased, reached over 11% and stability of QD solar cells has been improved8. In addition, it has been previously reported as well, the combination of perovskite and QDs has arisen new properties/phenomena which do not exist in single materials themselves. The detection of photoluminescence and electroluminescence exciplex states at lower energy bandgap than both perovskite and QDs has been observed9. However the interaction of perovskite and QDs is still not clearly understood. In this study, we will embed QDs in a perovskite matrix and focus on the effect of QD ligands as they decide the solubility, mechanical resistance of the films, inter-dot distance and importantly the QD surface passivation.
References.
[1]. Science 2017, 356, 1376-1379
[2]. J. Phys. Chem. Lett., 2015, 6, 1883–1890.
[3]. Adv. Mater., 2015, 27, 6157–6162.
[4]. Nat. Mater., 2015, 14, 636–642.
[5]. Nat. Photonics 2016, 10, 81.
[6]. Journal of Alloys and Compounds, (706), 2017, 395-400.
[7]. ACS Nano 2017, 11, 12378−12384.
[8]. Nature Materials 2017 (16), 258-263.
[9]. Nanoscale, 2016, 8, 14379
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