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Large Stokes shift downshifting Eu(III) films as efficiency enhancing UV blocking layers for dye sensitized solar cells
Author(s) -
Kennedy M.,
Ahmed H.,
Doran J.,
Norton B.,
BoschJimenez P.,
Pirriera M. Della,
TorralbaCalleja E.,
Tauste D. Gutiérrez,
Aubouy L.,
Daren S.,
SolomonTsvetkov F.,
Galindo S.,
Voz C.,
Puigdollers J.
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431683
Subject(s) - dye sensitized solar cell , materials science , energy conversion efficiency , optoelectronics , photocurrent , quantum efficiency , doping , stokes shift , luminescence , chemistry , electrode , electrolyte
Large Stokes shift downshifting organolanthanide complex, Eu(tta) 3 phen, is examined for inclusion in polymeric layers to replace the UV blocking layer in dye sensitized solar cell (DSSC) technology. The UV blocking layer increases stability but power conversion efficiency decreases as incident UV photons are not converted into photocurrent. Eu(tta) 3 phen doped polymeric film are prepared and attached to DSSC devices following optimized thickness and concentration from a ray‐trace numerical model for the specific DSSC. External quantum efficiency is significantly increased in the UV spectral region compared to DSSCs utilizing a passive, non‐luminescent, UV‐BL. High Eu(tta) 3 phen film transparency in the visible range minimizes DSSC EQE losses at visible wavelengths. Short‐circuit current ( I sc ) enhancement due to downshifting is demonstrated (∼1%) in small‐scale DSSC prototypes, where the specific geometry limits the photon collection efficiency and overall enhancement. Model predictions indicate that 2%–3% Isc enhancement is realizable in flexible single DSSC compared to, non‐luminescent, UV‐BL. Added to this, in outdoor conditions taking into account diffuse light, the increment in I sc can increase 50% more. Although photostability of the blended LSS‐DS polymer films is not sufficient to be useful for medium‐long term outdoor PV applications, the results demonstrate that significant efficiency enhancement can be realized.