High Efficiency Solid State Provskite Solar Cell Based on Poly (3-hexylthiophene) (P3HT) as HTM with Evaluation of Molecular Weight Values on Stability and Photovoltaic Parameters

Aldo Di Carlo^a, Fabio Matteocci^a, Narges Yaghoobi Nia^a

^aUniversity of Rome (Tor Vergara), C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome ‘‘Tor Vergata’’, via delPolitecnico 1, Rome 00133, Italy, Rome, 133, 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, Narges Yaghoobi Nia, 128
Publication date: 5th February 2015

Photovoltaics based on organic-inorganic perovskites offer new promise to focus on contemporaneous energy and environmental issue. During the past decade Poly (3-hexylthiophene) P3HT has become one of the most use component in organic electronics, which is related to high hole mobility and low cost. In this research, we have investigated the effect of different molecular weights of P3HT as a hole transport materials (HTMs) with same concentration and same thickness on the performance of the solid state provskite solar cell. On the other hand, we have also checked the best method for P3HT deposition (one step and two step). J-V measurements of the solar cells are investigated under AM1.5G irradiation and photoelectrochemical parameters like open-circuit voltage (Voc), short-circuit current density (Jsc), fill factor (FF) and the overall efficiency, are evaluated. In totally, by increase of the molecular weight, solar cell stability and photovoltaic values of the cells are enhanced which led to improvement of the overal efficiency. P3HT-based provskite solar cell with 124kDa and 500 nm thickness of titania scaffold layer, can improve the overal efficiency to 13.9 %, which is promising higher than the provskite solar cell with spiro-OMeTAD as HTM (same thickness of scaffold layer). Furthermore, overall efficiency of 124kDa P3HT used solar cells are almost similar to the cells with spiro-OMeTAD and 250 nm of titania scaffold layer. Recombinations due to electron transfer reaction of the cells are also investigated by cyclic voltammetery, dark currents, voltage decay and electrochemical impedance spectroscopy. The results confirm the decrease of recombination reaction with increase of the P3HT molecular weight. Effect of mesoporous titania scaffold thickness is evaluated and compared with spiro-based perovskite solar cells. Opposite to the cells based on Spiro HTM, photovoltaic parameters of the P3HT-based solar cells are enhanced with increase of thickness from 250 nm to 500 nm.

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