Fabrication of High Efficiency Perovskite Solar Cells

Li, Y., Cooper, J. K., Buonsanti, R., Giannini, G., Liu, Y., Toma, F. M. & Sharp, I. D. Fabrication of Planar Heterojunction Perovskite Solar Cells by Controlled Low-Pressure Vapor Annealing. J. Phys. Chem. Lett., 6, 493-499, DOI: 10.1021/jz502720a (2015).

Scientific Achievement

A new synthetic method based on low-pressure and reduced-temperature vapor annealing was developed and demonstrated to yield efficient hybrid halide perovskites with low hysteresis.

Significance & impact

Planar heterojunction perovskite devices exhibit 16.8% efficiency, repeatable performance, and reduced current-density hysteresis.  These planar devices aid corrosion protection efforts for integration into solar-fuels devices.

 

 

Reprinted with permission from Li, Y., Cooper, J. K., Buonsanti, R., Giannini, G., Liu, Y., Toma, F. M. & Sharp, I. D. Fabrication of Planar Heterojunction Perovskite Solar Cells by Controlled Low-Pressure Vapor Annealing. J. Phys. Chem. Lett., …

Reprinted with permission from Li, Y., Cooper, J. K., Buonsanti, R., Giannini, G., Liu, Y., Toma, F. M. & Sharp, I. D. Fabrication of Planar Heterojunction Perovskite Solar Cells by Controlled Low-Pressure Vapor Annealing. J. Phys. Chem. Lett., 6, 493-499, DOI: 10.1021/jz502720a (2015).  Copyright (2015) American Chemical Society.

Cross-section (above) and top view (below) SEM images of Cl-doped metal organic lead halide perovskite layers.  The best mixed halide CH3NH3PbI3–xClx perovskite solar cell is characterized by a short circuit current (Jsc) of 21.7 mA/cm2, an open circuit voltage (Voc) of 1.04 V, a fill factor (FF) of 0.75, and a PCE value of 16.8%.

Research Details

  • Demonstrated a two-step low-pressure vapor-assisted solution process for the fabrication of pinhole-free, continuous CH3NH3PbI3–xxCl layers for high efficiency thin-film photovoltaics.
  • Combination of X-ray, time-resolved optical, and microscopy techniques used for comprehensive analysis.
  • Integration of the this synthetic method with mesoporous architectures and interface engineering holds potential to further increase efficiency and reduce hysteresis.

Contact: fmtoma@lbl.gov, idsharp@lbl.gov