Built-in voltage of organic bulk heterojuction p-i-n solar cells measured by electroabsorption spectroscopy | Zendy

E. Siebert-Henze | Zendy; V. G. Lyssenko | Zendy; Janine Fischer | Zendy; Max L. Tietze | Zendy; R. Brueckner | Zendy; Martin Schwarze | Zendy; Koen Vandewal | Zendy; Debdutta Ray | Zendy; Moritz Riede | Zendy; Karl Leo | Zendy

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Built-in voltage of organic bulk heterojuction p-i-n solar cells measured by electroabsorption spectroscopy

Author(s) -

E. Siebert-Henze,

V. G. Lyssenko,

Janine Fischer,

Max L. Tietze,

R. Brueckner,

Martin Schwarze,

Koen Vandewal,

Debdutta Ray,

Moritz Riede,

Karl Leo

Publication year - 2014

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4873597

Subject(s) - work function , doping , materials science , optoelectronics , voltage , organic solar cell , spectroscopy , electric field , heterojunction , open circuit voltage , absorption spectroscopy , solar cell , absorption (acoustics) , analytical chemistry (journal) , layer (electronics) , chemistry , nanotechnology , optics , electrical engineering , physics , polymer , composite material , engineering , quantum mechanics , chromatography

We investigate the influence of the built-in voltage on the performance of organic bulk heterojuction solar cells that are based on a p-i-n structure. Electrical doping in the hole and the electron transport layer allows to tune their work function and hence to adjust the built-in voltage: Changing the doping concentration from 0.5 to 32 wt% induces a shift of the work function towards the transport levels and increases the built-in voltage. To determine the built-in voltage, we use electroabsorption spectroscopy which is based on an evaluation of the spectra caused by a change in absorption due to an electric field (Stark effect). For a model system with a bulk heterojunction of BF-DPB and C60, we show that higher doping concentrations in both the electron and the hole transport layer increase the built-in voltage, leading to an enhanced short circuit current and solar cell performance. © 2014 Author(s)

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