Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Efficient utilization of wide range of solar spectrum is one of the keys to construct ultra-high efficiency solar cells. PbS colloidal quantum dot (CQD) have been gaining much attention as promising constituent materials for solution processable near-infrared light harvesting solar cells because PbS QDs can absorb photon energy in a wider range of the solar spectrum. Among various CQD-based solar cells, PbS QD/ZnO-based depleted heterojunction solar cells showed high power conversion efficiency (PCE) over 11.3% in 2016. However, the short exciton and / or carrier diffusion lengths of PbS QD films limit the PbS QD active layer thickness of the solar cell, thereby limiting light harvesting efficiency in the infrared region. Thus we focused on solar cells composed of PbS QD/ZnO nanowire (NW) structures with the aim of achieving efficient carrier transport and light absorption in the near infrared region simultaneously. (JPCL.2013,4,2455;JPCC.2015,119,27265) In this presentation, we synthesized nine different PbS QDs whose first exciton absorption peak locates at (A:0.94μm;B:1.01μm;C: 1.04μm;D:1.10μm;E:1.18μm;F:1.30μm;G:1.52μm;H:1.63μm; I:1.84μm), and investigated the photovoltaic performance of the PbS QD/ZnO NW solar cells fabricated with the PbS QDs. The solar cell fabricated with the PbS QDs showing the first exciton absorption peak at 1.52μm reached a EQE of 30% at its peak, and gives a PCE of 5.5% (Jsc=27.7mA/cm2, Voc=0.373V, FF=0.538). The PCE is the highest efficiency reported to date for a solution processed solar cell working in the infrared region. One of the interesting findings is that the solar cells operating in infrared region (solar cells:G,H,I) produced high Voc and low Voc loss. (ACS Energy Lett.2017,2,2110) Based on these results, we will discuss the potential of PbS QD/ZnO NW solar cells for the middle and/or bottom subcells of multijunction solar cells.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.