Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

CuI/Lead Halide Perovskite Solar Cells

6,052 views

Published on

An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide
DOI: 10.1021/ja411014k

Published in: Education, Technology, Business
  • Be the first to comment

CuI/Lead Halide Perovskite Solar Cells

  1. 1. An Inorganic Hole Conductor for OrganoLead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide. Jeffrey A. Christians1, Raymond C. M. Fung,3 and Prashant V. Kamat*1,2 University of Notre Dame, Notre Dame, Indiana 46556 Laboratory, Department of Chemical and Biomolecular Engineering 2Department of Chemistry and Biochemistry 3Co-op Student, University of Waterloo, Canada 1Radiation DOI: 10.1021/ja411014k ®
  2. 2. The Need for Photovoltaics • Global energy use is growing at over 1% per year • ® This rate will cause energy consumption to nearly double by 2040 Renewable Energy Potential Hydroelectric Tides and Oceans 2 TW Geothermal 12 TW Wind Power 2-4 TW Source: EIA, International Energy Outlook (2013) 0.5 TW • Solar energy is by far the largest potential source for renewable energy Incident Solar Energy 120,000 TW Source: DOE, Basic Research Needs for Solar Energy Utilization (2005) 2
  3. 3. Perovskite Solar Cells • • Very rapidly, perovskite solar cells have surpassed 15% efficiency Sprio-OMeTAD and other organic hole conductors are very expensive • ® CuI offers the potential for lower cost Hodes, G. Perovskite-Based Solar Cells. Science 2013, 342, 317–318. 3
  4. 4. Fabrication & Characterization • • ® CuI is deposited from solution by an automated drop casting technique 0.1 M CuI in 39:1 chlorobenzene: di-n-propyl sulfide Au CuI TiO2/CH3NH3PbI3 FTO 4
  5. 5. Photovoltaic Performance Hole Conductor Champion CuI Averageα Maximumβ Champion Spiro-OMeTAD Averageα Maximumβ • • • JSC (mA/cm2) 17.8 12.1 ± 3.3 18.9 16.1 14.0 ± 1.7 17.0 VOC (V) 0.55 0.52 ± 0.06 0.62 0.79 0.78 ± 0.02 0.82 FF 0.62 0.60 ± 0.07 0.71 0.61 0.55 ± 0.07 0.65 ® η (%) 6.0 3.7 ± 1.1 -7.9 6.0 ± 1.1 -- Lower Open-Circuit Voltage (avg. 0.52V vs. 0.78V) Better photocurrent stability Higher fill factors (avg. 0.55 vs. 0.60) 5
  6. 6. Impedance Spectroscopy Equivalent Circuit Model Copper Iodide ® Rs = series resistance Rrec. = recombination resistance Cµ = chemical capacitance RHTM = HTM resistance CHTM = HTM capacitance Spiro-OMeTAD 6
  7. 7. Why CuI ≠ spiro-OMeTAD? CuI  lower Rrec.  Low VOC ® CuI  higher σHTM  High FF 7
  8. 8. Conclusions • Promising inorganic hole conductor for perovskite solar cells • Better current stability than spiroOMeTAD devices • Impedance Spectroscopy shows that low VOC is caused by high recombination • Nearly two orders of magnitude higher conductivity than spiroOMeTAD • Provides a potential low-cost replacement of spiro-OMeTAD and other organic HTMs 8 ®
  9. 9. Thank You ® An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide. Jeffrey A. Christians1, Raymond C. M. Fung,3 and Prashant V. Kamat*1,2 University of Notre Dame, Notre Dame, Indiana 46556 Chemical and Biomolecular Engineering 2Department of Chemistry and Biochemistry 3Co-op Student, University of Waterloo, Canada 1Radiation Laboratory, Department of DOI: 10.1021/ja411014k This research was supported by the U.S. Department of Energy Visit KamatLab.com for more research from our group or find us on Facebook at facebook.com/kamatlab! 9

×