Efficient Organic Photovoltaics with Improved Charge Extraction and High Short-Circuit Current | Zendy

Minu Mohan | Zendy; Vikas Nandal | Zendy; Sanish Paramadam | Zendy; Kasala Prabhakar Reddy | Zendy; Ramkumar Sekar | Zendy; Sumanshu Agarwal | Zendy; Chinnakonda S. Gopinath | Zendy; Pradeep R. Nair | Zendy; Manoj A. G. Namboothiry | Zendy

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Efficient Organic Photovoltaics with Improved Charge Extraction and High Short-Circuit Current

Author(s) -

Minu Mohan,

Vikas Nandal,

Sanish Paramadam,

Kasala Prabhakar Reddy,

Ramkumar Sekar,

Sumanshu Agarwal,

Chinnakonda S. Gopinath,

Pradeep R. Nair,

Manoj A. G. Namboothiry

Publication year - 2017

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.7b01314

Subject(s) - band offset , organic solar cell , materials science , optoelectronics , active layer , heterojunction , polymer solar cell , energy conversion efficiency , short circuit , charge carrier , photovoltaic system , open circuit voltage , photovoltaics , layer (electronics) , chemical engineering , nanotechnology , band gap , voltage , composite material , electrical engineering , valence band , thin film transistor , engineering , polymer

Exciton generation, dissociation, free carrier transport, and charge extraction play an important role in the short-circuit current (J(sc)) and power conversion efficiency of an organic bulk heterojunction (BHJ) solar cell (SC). Here we study the impact of band offset at the interfacial layer and the morphology of active layer on the extraction of free carriers. The effects are evaluated on an inverted BHJ SC using zinc oxide (ZnO) as a buffer layer, prepared via two different methods: ZnO nanoparticle dispersed in mixed solvents (ZnO A) and sol-gel method (ZnO B). The device with ZnO A buffer layer improves the charge extraction and J(sc),. The improvement is due to the better band offset and morphology of the blend near the ZnO A/active layer interface. Further, the numerical analysis of current-voltage characteristics illustrates that the morphology at the ZnO A/active layer interface has a more dominant role in improving the performance of the organic photovoltaic than the band offset

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