Fundamentals of Solar Cell Design. Rajender Boddula
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Название: Fundamentals of Solar Cell Design

Автор: Rajender Boddula

Издательство: John Wiley & Sons Limited

Жанр: Физика

Серия:

isbn: 9781119725046

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      The HOMO/LUMO energy levels of molecules should be well matched for the possible photochemical electron transfer between acceptor and donor molecules.

      To obtain high open-circuit voltage (VOC), a deep HOMO level is to be adjusted, since maximum value of the VOC is determined by the energy difference between the HOMO level of the donor and LUMO level of the acceptor.

      Balanced charge (negative and positive) mobility of the organic blend materials is required for controlled charge transport.

      Good solubility of blend organic materials is essential for good film forming property and well mixing with acceptor materials to form nanoscale phase separation and ideal blend morphology.

      Blend materials, higher thermal stability, and their phase transition temperature data are to be tuned properly.

      Research on BHJ organic solar cells resulting from fullerene as acceptor is dealt at length for the past several years. During the course of investigations by many researchers, it was found that fullerene has limitations in using it as acceptor in solar cell devices. The shortcomings or limitations with properties of fullerene are like negligible light absorption in NIR and visible region, shape of the molecule, solubility, controlling the film texture or film morphology, stability of fullerene, and very limited tunability of energy levels of fullerene. These limitations lead the researchers to explore novel materials to initiate work on non-fullerene derived acceptors for BHJ organic solar cells to replace fullerene and take the system to improve efficiency of organic solar cells. The following part describes BHJOSCs involving non-fullerene acceptors with polymer donors.

Chemical structures of Fused benzo-thiadiazole–dicyanoindenone compounds. Chemical structures of the fused seven rings with dicyanoindenone end groups. СКАЧАТЬ