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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Hund excitations and the efficiency of Mott solar cells

    摘要： We study the dynamics of photoinduced charge carriers in semirealistic models of LaVO3 and YTiO3 polar heterostructures. It is shown that two types of impact ionization processes contribute to the carrier multiplication in these strongly correlated multiorbital systems: The first mechanism involves local spin state transitions, while the second mechanism involves the scattering of high-kinetic-energy carriers. Both processes act on the 10-fs timescale and play an important role in the harvesting of high-energy photons in solar cell applications. As a consequence, the optimal gap size for Mott solar cells is substantially smaller than for semiconductor devices.

    关键词： LaVO3,Mott solar cells,impact ionization,YTiO3,carrier multiplication

    更新于2025-09-23 15:19:57

  • Enhanced photovoltaic efficiency and persisted photoresponse switchability in LaVO3/Pb(Zr0.2Ti0.8)O3 perovskite heterostructures

    摘要： For the ferroelectric photovoltaics, it is challenging to enhance the power conversion efficiency (PCE) without sacrificing the photoresponse switchability. Here, we demonstrate that enhanced PCE and good photoresponse switchability can be simultaneously achieved in perovskite heterostructures comprising narrow-gap semiconductor LaVO3 (LVO) and ferroelectric Pb(Zr0.2Ti0.8)O3 (PZT). The LVO(24 nm)/PZT(120 nm) based device exhibits a ~5-fold enhancement in PCE compared with the PZT-only based device, which is attributed to the enhanced absorption from the LVO layer and the built-in field at the LVO/PZT interface facilitating the separation of photo-generated e-h pairs. In addition, the switched photovoltage of the LVO/PZT based device is above 1 V, which is as large as that of the PZT-only based device. This persisted photoresponse switchability is obtained because the polarization can be fully switched in the LVO/PZT based devices when the LVO thickness is less than 24 nm. Our finding therefore provides a promising route for the development of the high-efficiency and highly switchable ferroelectric photovoltaic devices.

    关键词： perovskite heterostructures,ferroelectric photovoltaics,LaVO3,photoresponse switchability,power conversion efficiency,Pb(Zr0.2Ti0.8)O3

    更新于2025-09-11 14:15:04