Hysteresis-less and efficient planar perovskite solar cells using amorphous TiO2

Samy Almosni^a^,^b, Takeru Bessho^b, Satoshi Uchida^c, Takaya Kubo^a, Hiroshi Segawa^a^,^d, Tang Zeguo^a

^aResearch Center for Advanced Science and Technology (RCAST), The University of Tokyo, Japan, Japan

^bNextPV, LIA CNRS-RCAST/U. Tokyo-U. Bordeaux,The University of Tokyo, Japan, 4-chōme-6-1 Komaba, Meguro City, Tōkyō-to 153-0041, Japón, Meguro City, Japan

^cKomaba Organization for Educational Excellence (KOMEX), The University of Tokyo, Japan., 3-chōme-8-1 Komaba, Meguro City, Tōkyō-to 153-0041, Japón, Meguro City, Japan

^dDepartment of General Systems Studies, Graduate School of Arts and Sciences,The University of Tokyo, Japan., 3-chōme-8-1 Komaba, Meguro City, Tōkyō-to 153-0041, Japón, Meguro City, Japan

NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)

Perovskite Thin Film Photovoltaics (ABXPV18). 27-28 Feb

Rennes, France, 2018 February 27th - March 1st

Organizer: Jacky Even

Poster, Samy Almosni, 115
Publication date: 11th December 2017

The perovskite solar cells (PSCs) are promising candidates to reach the highest efficiency among the single junction solar cells due to the adapted bandgap around 1.55 eV, strong absorption and carrier diffusion length.[1] However, many process used to produce them leads to hysteresis in their I-V curve.[2] This notable mismatch between the forward and backward I-V scan, make difficult the assessment of the PSCs efficiencies. Our recent simulations results suggest that tunneling assisted trapping is one of the mechanism at the origin of the hysteresis.[3] In order, to make efficient (η>19%) and hysteresis-less PSCs we have developed an amorphous TiO₂ layer (a-TiO₂) using a simple recipe based on the TiCl₄ : methanol precursor solution annealed at low temperature (T_annealing<200°C). In this study first structural (XRD, SEM, XPS) and optical (Absorption) properties of this a-TiO₂ layer are compared with the properties of the more classical anatase TiO₂ obtained using the Titanium diisopropoxide bis(acetylacetonate) : ethanol precursor solution annealed at high temperature (>400°C). Then the electrical properties of PSCs having different perovskite composition and processed on these two kind of TiO₂ are studied. Finally, from the analysis of the hysteresis factor as a function of the perovskite conduction band position for the different TiO₂ layers, we suggest that the presence of a barrier and defect at the TiO₂ / perovskite interface influence the hysteresis factor.

References

[1] Kojima A, Teshima K, Shirai Y, et al. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells. J. Am. Chem. Soc. 2009;131:6050–6051.

[2] Snaith HJ, Abate A, Ball JM, et al. Anomalous Hysteresis in Perovskite Solar Cells. J. Phys. Chem. Lett. 2014;5:1511–1515.

[3] Almosni S, Cojocaru L, Li D, et al. Tunneling-Assisted Trapping as one of the Possible Mechanisms for the Origin of Hysteresis in Perovskite Solar Cells. Energy Technol. 2017;5:1767–1774.

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