P3HT-PMMA blend as an efficient, stable and cheap hole-transporter for organic-inorganic perovskite solar cells

Sandeep Pathak^a, Severin Habisreutinger^a, Konrad Wojciechowski^a, Henry Snaith^a, Alba Pellaroque^a, Tomas Leijtens^b

^aUniversity of Oxford, Clarendon Laboratory, Parks rd, Oxford, 0, United Kingdom

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, Alba Pellaroque, 223
Publication date: 5th February 2015

Solution-processed organic–inorganic perovskite solar cells have recently emerged as the leading emerging technology in photovoltaics research. Although most of the community mainly focuses on the achievement of high power conversion efficiencies, moisture degradation of perovskite via ingress through the hole transporter material (HTM) represents a substantial problem. Moreover, due to the high commercial prices of the commonly used spiro-OMeTAD and its tendency to be uncontrollably doped by O₂, cheaper alternatives HTMs need to be investigated. Here, we develop a dopant free hole-transporter composite by blending P3HT semiconducting polymer with insulating PMMA. This results in improved device lifetime by reducing moisture degradation and leads to a substantial increase in open-circuit voltage, as compared to cells employing neat P3HT. Interestingly, we observe a substantial enhancement in photoluminescence yield, with lifetimes greater than 1um and a PLQE reaching 30% even in the presence of the hole-transporter blend. Such blend also appears to be highly transparent, due to the reduced quantity of P3HT employed in the PMMA matrix, and hence also reduces the production cost of the HTM layer by 10 fold, as compared to spiro-OMeTAD, making it highly attractive for commercialisation.
Photoluminescence spectra (a) and time resolved measurements (b) taken at the peak emission wavelength.

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