Transport parameters of perovskite solar cells

30 01 2015

This paper reports an excellent characterization of different tarnsport and recombination parameters of organolead trihalide MAPbX3 (MA = CH3NH3+; X = Br– or I–) single crystals. One important result is the very low density of traps that is infered from space charge limited current measurements

Science 30 January 2015:
Vol. 347 no. 6221 pp. 519-522
DOI: 10.1126/science.aaa2725

Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystals

  1. Dong Shi1,*,
  2. Valerio Adinolfi2,*,
  3. Riccardo Comin2,
  4. Mingjian Yuan2,
  5. Erkki Alarousu1,
  6. Andrei Buin2,
  7. Yin Chen1,
  8. Sjoerd Hoogland2,
  9. Alexander Rothenberger1,
  10. Khabiboulakh Katsiev1,
  11. Yaroslav Losovyj3,
  12. Xin Zhang4,
  13. Peter A. Dowben4,
  14. Omar F. Mohammed1,
  15. Edward H. Sargent2,
  16. Osman M. Bakr1,


The fundamental properties and ultimate performance limits of organolead trihalide MAPbX3 (MA = CH3NH3+; X = Br or I) perovskites remain obscured by extensive disorder in polycrystalline MAPbX3 films. We report an antisolvent vapor-assisted crystallization approach that enables us to create sizable crack-free MAPbX3single crystals with volumes exceeding 100 cubic millimeters. These large single crystals enabled a detailed characterization of their optical and charge transport characteristics. We observed exceptionally low trap-state densities on the order of 109 to 1010 per cubic centimeter in MAPbX3 single crystals (comparable to the best photovoltaic-quality silicon) and charge carrier diffusion lengths exceeding 10 micrometers. These results were validated with density functional theory calculations.

See also>

Electron-hole diffusion lengths >175 μm in solution grown CH3NH3PbI3 single crystals

Qingfeng Dong,

Yanjun Fang,

Yuchuan Shao,

Pahraic Mulligan,

Jie Qiu,

Lei Cao,

and Jinsong Huang

Science aaa5760Published online 29 January 2015

Long, balanced electron and hole diffusion lengths greater than 100 nanometers in polycrystalline CH3NH3PbI3 are critical for highly efficient perovskite solar cells. We report that the diffusion lengths in CH3NH3PbI3 single crystals grown by a solution-growth method can exceed 175 μm under 1 sun illumination and exceed 3 mm under weak light for both electrons and holes. The internal quantum efficiencies approach 100% in 3 mm-thick single crystal perovskite solar cells under weak light. These long diffusion lengths result from greater carrier mobility, lifetime and dramatically smaller trap densities in the single crystals than polycrystalline thin-films. The long carrier diffusion lengths enabled the use of CH3NH3PbI3 in radiation sensing and energy-harvesting through gammavoltaic effect with an efficiency of 3.9% measured with an intense cesium-137 source.

High-efficiency solution-processed perovskite solar cells with millimeter-scale grains

Wanyi Nie,






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