Abstract
Abstract It is still ambiguous whether the electron-hole pair (exciton) or free-charge dominates the photovoltaic mechanism in organic-inorganic perovskite solar cell. Understanding the electron-hole pair or free charge transport is very essential to improve the diffusion length and cell's performance. We present a unified theoretical model to describe the excitation transport for organic-inorganic perovskite solar cell. The proposed model predicts the contribution from the electron-hole pair and free-charge to the transport property and photoinduced charge transfer process. Moreover, the proposed model can well interpret the transport feature of exciton or free-charge by combining material inhomogeneity (disorder), exciton binding energy, temperature, and photon density. Our results provide the information about the exciton or free-charge transfer processes that is needed for developing high-efficiency perovskite solar cells.
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