NiO/MAPbI3-xClx/PCBM: A Model Case for an Improved Understanding of Inverted Mesoscopic Solar Cells

Andrea Listorti^a, Vanira Trifiletti^a

^aItalian Institute of Technology, via Barsanti 1, Arnesano (LECCE), 73010, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Vanira Trifiletti, 360
Publication date: 5th February 2015

The basic photovoltaic mechanisms of solar converting device bearing mesoscopic (Ms) NiO, MAPbI_3-xCl_x or MAPbI₃ (MA = CH₃NH₃) and PCBM as active components is investigated. Efficient hole transfer from both perovskites to the Ms NiO is demonstrated. An efficient hole transfer process from perovskite to nickel oxide is assessed, for both the employed absorbing species, namely MAPbI_3-xCl_x and MAPbI₃. As the charge transport is occurring in the Ms matrix, specific solutions are suggest to overcome the intrinsic limitations of this class of devices. To have an effective comparison between MAPbI₃ and MAPbI_3-xCl_x, perovskites have been processed through the same procedure: in our comparative study MAPbI_3-xCl_x and MAPbI₃ are both spin-coated in one-step from the precursor solution of either PbCl₂ or PbI₂ with MA in dimethylformamide. As required for a reliable comparison, scanning electron microscopy (SEM) imaging shows that the coverage and morphology of the two perovskites onto Ms NiO are similar; light harvesting properties and photovoltaic parameters for the two perovskite layers are comparable as well. PL quenching and cw-photoinduced absorption on working device and on derived reference systems are carried out: holes injection and transport through Mesoporous NiO film is verified to be the dominant mechanism of charge collection, in contrast to what observed for electrons in mesoporous n-type TiO₂-based devices.^2-4Consequently, efforts to achieve efficient perovskite p-type solar cells, based on Ms NiO hole acceptor media, should be devoted to reduction of the NiO thickness and to the optimization of the NiO/perovskite interface. A fine optimization and engineering of NiO-based solar cells, passing through the comprehension of their basic PV mechanism, would lead in the future to high efficient devices, combined with high voltages and long term stability.

(1) Trifiletti, V.; Roiati, V.; Colella, S.; Giannuzzi, R.; De Marco, L.; Rizzo, A.; Manca, M.; Listorti, A.; Gigli, G., NiO/MAPbI3-xClx/PCBM: A Model Case for an Improved Understanding of Inverted Mesoscopic Solar Cells. ACS Applied Materials & Interfaces 2015, DOI: 10.1021/am508678p. (2) Roiati, V.; Colella, S.; Lerario, G.; De Marco, L.; Rizzo, A.; Listorti, A.; Gigli, G., Investigating charge dynamics in halide perovskite-sensitized mesostructured solar cells. Energy & Environmental Science 2014, 7 (6), 1889-1894. (3) Roiati, V.; Mosconi, E.; Listorti, A.; Colella, S.; Gigli, G.; De Angelis, F., Stark Effect in Perovskite/TiO2 Solar Cells: Evidence of Local Interfacial Order. Nano Letters 2014, 14 (4), 2168-2174. (4) De Bastiani, M.; D’Innocenzo, V.; Stranks, S. D.; Snaith, H. J.; Petrozza, A., Role of the crystallization substrate on the photoluminescence properties of organo-lead mixed halides perovskites. APL Materials 2014, 2 (8),081509.

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.