Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
Bulk heterojunction (BHJ) solar cells based on colloidal QDs and metal oxide nanowires (NW) possess unique and outstanding advantages in light harvesting and charge collection. However, the high surface area of NW structure often brings about large amount of recombination (especially interfacial recombination) and limits the open-circuit voltage in BHJ solar cells [1,2]. This problem is solved here by passivating the surface of metal oxide component in PbS colloidal quantum dot solar cells (CQDSCs). By coating thin TiO2 layers on ZnO-NW surfaces, the open-circuit voltage and power conversion efficiency have been improved over 40% in PbS CQDSCs. The transient photovoltage decay and impedance spectroscopy characterizations indicated that the interfacial recombination was significantly reduced by the surface passivation strategy. High efficiency of 6.13% was achieved through the passivation approach and optimization for the length of ZnO-NW arrays (device active area: 16 mm2). All solar cells were tested under air conditions, and exhibited excellent air storage stability (without any performance decline over more than 130 days). This work highlights on the significance of metal oxide passivation in achieving high performance BHJ solar cells. The charge recombination mechanism uncovered in this work would shed light on the further improvement of PbS CQDSCs and/or other types of solar cells.
Fig. (a) Stability evaluation of bare and surface-passivated PbS CQDSCs with 1.6 ƒÊm length NW arrays. All devices were stored and tested in ambient atmosphere. (b) J-V curves of a NW length-optimized ZnO@TiO2/PbS cell measured by forward and reverse scans under AM 1.5 G illumination.
[1] J. Jean, S. Chang, P. R. Brown, J. J. Cheng, P. H. Rekemeyer, M. G. Bawendi, S. Gradeèak and V. BuloviE Adv. Mater., 2013, 25, 2790-2796. [2] H. Wang, T. Kubo, J. Nakazaki, T. Kinoshita and H. Segawa, J. Phys. Chem. Lett., 2013, 4, 2455-2460.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.