Solution-Processed Solid-State Quantum Dot-Sensitized Solar Cells with Low-Toxic CuInS2 Quantum Dots

Hans Ågren^a, Jing Huang^a, Bo Xu^a

^aKTH The Royal Institute of Technology, Roslagstullsbacken 21, Stockholm, Sweden

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, Jing Huang, 361
Publication date: 5th February 2015

Due to the potential issues that arise from the volatility and leakage of the liquid electrolytes, the development of solid state solar cells is of great significance, especially for quantum dot-sensitized solar cells (QDSCs). The commonly used liquid polysulfide electrolyte in QDSCs not only limits the V_oc of the solar cells, but also induces the poor stability of QDSCs. Therefore, it is necessary to replace the liquid electrolytes with solid hole transporting materials (HTMs), to construct solid-state quantum dot-sensitized solar cells (ss-QDSCs). Until now, few works were focus on the solid state QDSCs, and most of them employed CdS, CdSe or PbS as sentisitizers, which always contain toxic elements-Cd or Pb. In this work, it is the first time that the low-toxic colloidal CuInS₂ QDs were introduced in ss-QDSCs as sensitizer by low-cost solution process, and 2,2´,7,7´-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9´-spirobifluorene (Spiro-OMeTAD) was used as the HTM. After optimizing the pore size of TiO₂ electrode and the quality of the CuInS₂ QDs, an efficiency of up to 1.17% was obtained.

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