Absorption-induced external quantum efficiency modulation in organic nanocrystals incorporated organic solar cells

Azhakanantham, D and Viswanathan, VN and Selvamani, M and Kesavan, AV and Alotaibi, MA and Ramamurthy, PC (2024) Absorption-induced external quantum efficiency modulation in organic nanocrystals incorporated organic solar cells. In: Journal of Materials Science: Materials in Electronics, 35 (27).

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Abstract

The various loss mechanisms lead to low power conversion efficiency in organic photovoltaics. One of the main limitations is insufficient spectral coverage, to overcome this loss mechanism various methodologies were adopted. In this work, NS1 small molecule nanocrystals has been introduced in conventional P3HT:PC70BM binary system to study its effects on spectral response and photovoltaic performance. Introduction of NS1 nanocrystal improve cascaded energy level alignment between donor and acceptor semiconductors and provide well-aligned energy level, results in enhanced fill factor. The variation of Voc was seen with respect to polymer and NS1 ratio. Influence of optoelectronic properties of photoactive layer and photovoltaics parameters were analyzed detailly. At incorporation of optimized NS1 ratio, charge transfer process between P3HT and PC70BM improved and reduced recombination was seen. Composition-dependent PV parameter was investigated and discussed detailly. Host organic semiconductor nanocrystal in polymer photoactive layer favors the complementary optical absorption of forbidden absorption region of P3HT. This process was confirmed by external quantum efficiency and lowered leakage current. It is noted that UV visible spectrum trend was noted in the external quantum efficiency measurement. This work suggests that utilizing organic small molecule nanocrystal with optimized ratio will enable optical absorbance throughout the visible region. Further study would give enhanced performance attributed by widened spectral response. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Publishers.
Keywords:	Conducting polymers; Nanocrystals; Organic solar cells; Photoacoustic effect; Semiconductor quantum wells; Solar power generation, External quantum efficiency; Loss mechanisms; Low Power; Organic nanocrystals; Organic photovoltaics; Organics; Photoactive layers; Power conversion efficiencies; Spectral coverage; Spectral response, Quantum efficiency
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	19 Oct 2024 07:16
Last Modified:	19 Oct 2024 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/86485

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