Charge Transfer and Separation on Modified Interfaces of Copper Mediated Solar Cells Sensitized with Indoline and Triphenylamine Dyes

Adam Glinka^a, Mateusz Gierszewski^a, Błażej Gierczyk^b, Gotard Burdziński^a, Marina Freitag^c, Marcin Ziółek^a

^aQuantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, Poznan, 61-614, Poland

^bFaculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, Poznań, 61-614, Poland

^cSchool of Natural and Environmental Sciences, Newcastle University, UK, Newcastle upon Tyne, Reino Unido, Newcastle upon Tyne, United Kingdom

International Conference on Hybrid and Organic Photovoltaics
Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)

Online, Spain, 2020 May 26th - 29th

Organizers: Tracey Clarke, James Durrant, Annamaria Petrozza and Trystan Watson

Poster, Adam Glinka, 070
Publication date: 22nd May 2020

ePoster:

Decreasing of the potential losses and restraining recombination on the semiconductor | dye | electrolyte interface are main battles of pushing forward of DSSCs performance. Advances made in the field of novel redox couples based on organometallic complexes^1,2 decreased the voltage losses significantly compared with iodide/triiodide (I^-/I₃^-) redox couple. High redox activity facilitates efficient dye regeneration, however enhanced redox activity allows easier undesired electron recapture from titania conduction band.

In this ePoster the effects of novel recombination blocking treatment, consisting of encapsulation of dye attached to titania surface by macrocyclic cucurbit(7)uril molecules, will be presented and compared with molecular passivation³. For this studies, D205 indoline sensitizer⁴ and its newly synthesized silyl-anchoring derivative in cooperation with Cu(tmby) redox mediator² were utilized.⁵

The recombination blocking properties were studied by means of small light perturbation lifetime measurements, electrochemical impedance spectroscopy (EIS). The electron lifetime was found to be improved especially in CB7 treated samples due to charge transfer resistance enhancement. Furthermore, the photovoltaic performance was found to be improved by the interface modifications due to demonstrated blocking properties. The highest improvements were observed for the cells with silyl-anchoring derivative of D205.

Complete solar cells were also studied by transient absorption technique from femtosecond to millisecond time scale. No retardation of dye regeneration by redox couples due to interface modification was found in nanosecond flash photolysis. Moreover, indoline dyes regeneration by Cu(tmby) redox couple was found to occur within 25-35 ns what is outstandingly fast in comparison with the state of art triphenylamine dyes.

We hope that our findings may contribute to further development of novel sensitizers and understanding of sensitized titania/electrolyte interface phenomena.

References:

[1] Feldt, S. et al. J. Am. Chem. Soc. 2010, 132 (46), 16714–16724.

[2] Saygili, Y. et al. J. Am. Chem. Soc. 2016, 138 (45), 15087–15096.

[3] Kakiage, K. et al. Chem. Commun. 2014, 50 (48), 6379–6381.

[4] Ito, S. et al. Chem. Commun. 2008, No. 41, 5194–5196.

[5] Glinka, A. et. al. J. Phys. Chem. C 2020, 124, 5, 2895–2906

Acknowledgements:

The work was supported by projects of NCN (National Science Centre, Poland), 2015/18/E/ST4/00196.

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.

MATSUS

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.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

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.