Proceedings of nanoGe Fall Meeting 2021 (NFM21)
Publication date: 23rd September 2021
The concept of combining organic solar cells for energy harvesting and an electrochemical energy storage component into an integrated compact device exhibits significant advantages: besides the space-saving aspect, a device of this kind could not only find its application in small self-powering sensors, but also in the field of smart clothing.[1]
For the realization of a photo-rechargeable system, it is crucial that the organic solar cell delivers a sufficiently high voltage, to allow the photo-charging process. Strategies to reach high voltages would be the usage of tandem solar cells [2] or modules, however, this would make the device structure more complicated and difficult to optimize. On the other hand, single-junction organic solar cells with open-circuit voltages above 1.25 V are rare.[3]
In this work, we present single-junction organic solar cells based on PMI-FF-PMI, a non-fullerene perylene-monoimide acceptor, which was able to achieve open-circuit voltages above 1.1 V in combination with the polymeric donor PBDB-T.[4] By blending PMI-FF-PMI with the conjugated polymer D18, which has a downshifted HOMO level compared to PBDB-T, an open-circuit voltage of 1.38 V could be obtained, representing one of the highest photovoltages reached with single-junction organic solar cells so far. These solar cells are prepared in an inverted device architecture and typically reveal photocurrents up to 7.5 mA/cm2, fill factors of 60% and in combination with the high photovoltage, power conversion efficiencies between 5 and 6% are obtained.
In this contribution, we present a thorough analysis of the characteristics of these high-photovoltage organic solar cells including optoelectronic, morphological and recombination properties. Moreover, we give an outlook on their potential direct coupling with a lithium-ion battery as well as battery materials suitable for this application.
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