Advanced Materials, Vol.27, No.5, 917-921, 2015
Synergistic Doping of Fullerene Electron Transport Layer and Colloidal Quantum Dot Solids Enhances Solar Cell Performance
The spatial location of the predominant source of performance-limiting recombination in today's best colloidal quantum dot (CQD) cells is identified, pinpointing the TiO2: CQD junction; then, a highly n-doped PCBM layer is introduced at the CQD: TiO2 heterointerface. An n-doped PCBM layer is essential to maintain the depletion region and allow for efficient current extraction, thereby producing a record 8.9% in overall power conversion efficiency.
Keywords:colloidal quantum dots;depleted heterojunctions;PbS;[6;6]-phenyl-61-butyric acid methyl ester (PCBM);photovoltaics