4.6 Article

Impact of the Halide Cage on the Electronic Properties of Fully Inorganic Cesium Lead Halide Perovskites

期刊

ACS ENERGY LETTERS
卷 2, 期 7, 页码 1621-1627

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00416

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资金

  1. ANR JCJC project milliPICS
  2. Region Midi-Pyrenees [MESR 13053031]
  3. BLAPHENE
  4. TERASPEC project
  5. IDEX Toulouse
  6. Emergence program Programme des Investissements d'Avenir [ANR-11-IDEX-0002-02, ANK-10-LABX0037-NEXT]
  7. Chinese Scholarship Council (CSC)
  8. U.K. government
  9. EPSRC (U.K.) via its membership to the EMFL [EP/N01085X/1]
  10. EPSRC [EP/N01085X/1] Funding Source: UKRI
  11. Engineering and Physical Sciences Research Council [EP/N01085X/1] Funding Source: researchfish

向作者/读者索取更多资源

Perovskite solar cells with record power conversion efficiency are fabricated by alloying both hybrid and fully inorganic compounds. While the basic electronic properties of the hybrid perovskites are now well understood, key electronic parameters for solar cell performance, such as the exciton binding energy of fully inorganic perovskites, are still unknown. By performing magneto transmission measurements, we determine with high accuracy the exciton binding energy and reduced mass of fully inorganic CsPbX3 perovskites (X = I, Br, and an alloy of these). The well-behaved (continuous) evolution of the band gap with temperature in the range of 4-270 K suggests that fully inorganic perovskites do not undergo structural phase transitions like their hybrid counterparts. The experimentally determined dielectric constants indicate that at low temperature, when the motion of the organic cation is frozen, the dielectric screening mechanism is essentially the same for both hybrid and inorganic perovskites and is dominated by the relative motion of atoms within the lead halide cage.

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