Enhancement of outdoor stability on dye-sensitized solar cells by spectrum conversion layer with 1,8-naphthalimide derivatives

Sungjun Hong^a, Chi-Hwan Han^a

^aKorea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon, 305, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Chi-Hwan Han, 320
Publication date: 5th February 2015

We propose a novel UV conversion layer using unique combination of spectrum conversion materials with UV absorbing 1,8-naphthalimide derivatives in poly (ethylene-co-vinyl acetate) on the photo-anode. This functional layer on the photo-anode absorbed effectively the UV light having bad influence for outdoor stability in advance and emitted a longer wavelength light by Stokes fluorescence. Both absorption and emission of light by the proposed functional layer are unique characteristics of a combination of 1,8-naphthalimide derivatives which form exciton complex molecules at high concentration under UV absorption. Optical absorbance range of spectrum conversion layer (SCL) covered from 315 nm to 450 nm, which was wider than the overall optical absorbance range of TiO₂ nanoparticle layer. The absorbance and Stokes shift of SCL could be controlled by increasing the concentration of 1,8-naphthalimide derivatives in SCL. Photo-conversion efficiency enhancement of DSSC by the spectrum conversion of UV light to visible light for the sensitizing dye was definitely proven by measuring the incident photon-to-current efficiency (IPCE) showing extraordinarily higher efficiency at UV range below 370 nm.

As a result of converting absorbed UV light as a visible light source for the sensitizing dye, the relative efficiency of the proposed DSSCs have shown only 1.4% initial drop and maintained 11% higher level after 48 days outdoor condition than bare DSSCs without SCL.

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