Vibrational and photovoltaic properties of CH3NH3PbI3-xClx perovskites

Athanasios Kontos^a, Polycarpos Falaras^a, Eirini Siranidi^a, Maria Antoniadou^a

^aInstitute of Nanoscience and Nanotechnology, NCSR DEMOKRITOS, Patriarchou Grigoriou & Neapoleos Str., Agia Paraskevi, Athens, 15310, Greece

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, Athanasios Kontos, 182
Publication date: 5th February 2015

Organolead halide perovskites are low cost, easily synthesized and very promising materials, able to act as light absorbers having tunable gap and both electron-hole transporting properties. Perovskites were first introduced in solar cells in 2009 by Kojima and co-workers ^[1], who used 3D structures of CH₃NH₃PbX₃ (X =Br or I) as sensitizers in liquid dye-sensitized solar cells. Based on the triiodide analogue the authors obtained power conversion efficiency (PCE) as high as 3.8%, attributed to the narrow bandgap energy of this perovskite material that results in higher harvesting ability and thereby higher photocurrent. Since then, perovskite solar cells emerged as an excellent alternative in the field of solid-state mesoscopic solar cells, achieving efficiencies of over 18% ^[2]. Perovskite solar cells have a lamellar structure mainly composed by a porous layer of a nanocrystalline metal oxide which is impregnated with a perovskite light harvesterand being in contact with an appropriate hole transporting material. However, it is widely known that organic-inorganic lead halide perovskites are very sensitive and can easily be decomposed in the presence of moisture owing to the hygroscopic amine moiety ^{[3, 4}]. For this reason; it is recommended to carry out their fabrication in a dry and high purity inert atmosphere, such as argon or nitrogen. In this work, we compare the photoelectrochemical stability of CH₃NH₃PbI₃ and CH₃NH₃PbI_3-xCl_x perovskite solar cells, examining the materials properties, following their preparation and characterization in ambient conditions ^[5]. Using micro-Raman spectroscopy it has been confirmed that the perovskites are very sensitive and their stability is influenced upon exposure in air atmosphere. The observed differences are discussed in terms of the materials vibrational properties and the corresponding device performance.

[1] Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T.; J. Am. Chem. Soc. 2009, 131, 6050 [2] Zhou, H.; Chen, Q.; Li, G.; Luo, S.; Song, T.-B.; Duan, H.-S.; Hong, Z.; You, J.; Liu, Y.; Yang, Y.; Science 2014, 345, 542 [3] Noh, J.-H.; Im, S.H.; Heo, J.H.; Mandal T.N.; Seok, S.I.; Nano Lett., 2013, 10, 1764 [4] Cheng Z.; Lin, J.; Cryst. Eng. Comm., 2010, 12, 2646 [5] Antoniadou, M.; Siranidi, E.; Vaenas, N.; Kontos, A.G.; Stathatos, E.; Falaras, P.; JSIM, In Press

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