Reduced recombination losses in planar perovskite devices via amine based polymer

Neeti Tripathi^a^,^b, Masatoshi Yanagida^b^,^c, Yasuhiro Shirai^b^,^c, Kenjiro Miyano^b

^aDepartment of Physics, School of Physical Sciences, Doon University, Kedarpur, Dehardun, Uttarakhand 24800, INDIA

^bGlobal Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute of Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, JAPAN

^cPhotovoltaic Materials Unit, National Institute of Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, JAPAN.

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)

Benidorm, Spain, 2018 May 28th - 31st

Organizers: Emilio Palomares and Rene Janssen

Poster, Neeti Tripathi, 198
Publication date: 21st February 2018

Since the development of perovskite solar cell, combination of low temperature processing and high efficiency perovskite solar cells has always been in demand. Undoubtedly, planar perovskite solar cell with p-i-n configuration [where, p = poly83,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS), i = MAPbI3 and n=[6,6-phenyl-C61-butyric acid methyl ester (PCBM)] owes both the advantages. However the maximum open circuit voltage (Voc) obtained in this configuration is usually lower than the TiO2 based perovskite solar cell due the partial misalignment of corresponding energy levels for charge transfer, which results in recombination losses at interfaces.

Here, we demonstrate a strategy to improve the open-circuit voltage of inverted planar perovskite solar cell by successive inclusion of alkyl amino compounds, in perovskite precursor solution with varying the number of carbon present in the polymer chain. As a result, we observed a drastic improvement in the Voc from 0.87 to 0.96 V and efficiency from 12.10% to 14.31% for the pristine device and additive based device, respectively. More interestingly, we could observe a successive enhancement in the Voc by increasing the number of carbon in the polymer chain. The detailed investigations on the elemental distribution, perovskite morphology, photovoltaic performance and stability of the devices will be discussed.

References:

N. Tripathi, M. Yanagida, Y. Shirai, T. Masuda, L. Han, K. Miyano, J. Mat. Chem. A, 3, 12081 (2015).

K. Miyano, M. Yanagida, N. Tripathi, Y. Shirai, Applied Physics Letter 106, 093903 (2015).

N. Tripathi, Y. Shirai, M. Yanagida, A. Karen and K. Miyano, ACS Applied Material & Interfaces, 8 (7), 4644 (2016).

K. Miyano, M. Yanagida, N. Tripathi, Y. Shirai, J. Phys. Chem. Lett., 7 (12), 2240 (2016).

K. Miyano, N. Tripathi, M. Yanagida, and Y. Shirai, Accounts of Chemical Research, 49 (2), 303 (2016).

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