Simultaneous band gap narrowing and carrier lifetime prolongation of organic-inorganic trihalide perovskites

Abstract

The organic-inorganic hybrid lead trihalide perovskites have been emerging as the most attractive photovoltaic material. As regulated by Shockley-Queisser theory, a formidable materials science challenge for the next level improvement requires further band gap narrowing for broader absorption in solar spectrum, while retaining or even synergistically prolonging the carrier lifetime, a critical factor responsible for attaining the near-band gap photovoltage. Herein, by applying controllable hydrostatic pressure we have achieved unprecedented simultaneous enhancement in both band gap narrowing and carrier lifetime prolongation (up to 70~100% increase) under mild pressures at ~0.3 GPa. The pressure-induced modulation on pure hybrid perovskites without introducing any adverse chemical or thermal effect clearly demonstrates the importance of band edges on the photon-electron interaction and maps a pioneering route towards a further boost in their photovoltaic performance.

23 pages, 4 figures

References in corpus (3)

• Restoring the density-gradient expansion for exchange in solids and surfaces
• Generalized gradient approximation for solids and their surfaces
• The Efficiency Limit of CH3NH3PbI3 Perovskite Solar Cells

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• Using Pressure to Unravel the Structure-Dynamic-Disorder Relationship in Metal Halide Perovskites
• Strain-induced metallization and defect suppression at zipper-like interdigitated atomically thin interfaces enabling high-efficiency halide perovskite solar cells
• Pressure-Induced Phase Transition Versus Amorphization in Hybrid Methylammonium Lead Bromide Perovskite
• Description of Excitonic Absorption Using the Sommerfeld Enhancement Factor and Band-Fluctuations
• Absence of Anomalous Electron-Phonon Coupling in the Temperature Renormalization of the Gap of CsPbBr${}_3$ Nanocrystals
• Tuning Nonradiative Recombination via Cation Substitution in Inorganic Antiperovskite Nitrides