Boosting Efficiency and Thermal stability of Large Area Perovskite Solar Modules Beyond 16.5%: The case of Polymeric and Small Molecule Hole Transport Layer
Narges Yaghoobi Nia a, Mahmoud Zendehdel a b, Luigi Angelo Catriotta a, Zhaoxiang Zheng a, Aldo Di Carlo a c
a CHOSE - Centre for Hybrid and Organic Solar Energy, University of Rome ‘‘Tor Vergata’’, Via del Politecnico, 1, Roma, Italy
b 2 K.S.R.I (Kimia Solar Research Institute), Kimia Solar Company, Kashan, 87137-45868, Iran.
c Istituto di Struttura della Materia, CNR-ISM, Italy, Via del Fosso del Cavaliere, 100, Roma, Italy
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Oral, Narges Yaghoobi Nia, presentation 061
Publication date: 25th November 2019

Stability beside efficiency is rapidly becoming the most important topic in perovskite solar cells research. Spiro-OMeTAD, Poly(3-Hexylthiophene) (P3HT) and poly(triaryl amine) (PTAA) are the most common small molecule and organic semiconducting polymers which are used as  hole transport material (HTM) in perovskite solar cell [1,2]. Regarding the thermal stability issue, Spiro-OMeTAD starts crystallizing at 85 °C due to its low glass transition temperature inducing a significant deterioration of the hole mobility and a consequent thermal instability of PSCs. Thermal stability can significantly improve by replacing the Spiro-OMeTAD with PTAA and P3HT polymers attributed to instinct characteristics of polymer as oxygen impermeability and hydrophobicity [3,4,5].In this work, we fabricated high efficiencyperovskite solar modules using PTAA and Spiro-OMeTAD, which had achieved a hysteresis-freephotoconversion efficiencies above 16.5% with active area of 43 cm2which is among the highest reported in the field of perovskite solar modules. Improving Voc was observed in the case of PTAA as HTM. The photovoltaic (PV) performance, thermal stability and light stability, UV-Vis absorbance, Photoluminscence (PL), Electrochemical Impedance Spectroscopy (EIS), Cyclic Voltammetry (CV), Transient Photovoltage and Photocurrent Fall/Rise analysis have been investigated and compared for Spiro-OMeTAD and PTAA based PSCs. PTAA-based encapsulated devices show more than 1000 h thermal stability at 85 °C under atmospheric condition and it shows better thermal stability respect to the Spiro-OMetad in which is serves as a suitable candidate for scale-up the PSCs.However, in the case of light stability,we did not observedhuge differences between polymeric and small molecules HTM. Non-encapsulated devices show promising shelf life stability around 1800 hunder N2 filled environment equalfor both Spiro-OMeTAD and PTAA HTMs.

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