离子生成的内建平衡空间电荷区--卤化铅钙钛矿界面的范式转变
Ionically generated built in equilibrium space charge zones -- a paradigm change for lead halide perovskite interfaces
摘要：
甲基碘化铅铵（Methylammonium lead iodide，简称MAI）是被广泛研究的用于光致发光的钙钛矿类的原型。然而，即使是均衡方面也远未被完全理解。在这里，我们讨论的平衡空间电荷效应在Al 2 O3/TiO 2和Al 2 O3/Al 2 O3界面，这是太阳能电池的重要意义。不同于光伏文献中，这样的内置电位被认为是由电子载流子单独产生的，我们将适用于一个广义的图片，认为离子和电子载流子的平衡分布。我们给出的实验证据表明，这是负责的平衡空间电荷电位的离子，在接触的原因是一个显着的离子吸附。由离子再分布产生的平衡空间电荷效应的发生尚未被考虑用于光伏材料，并且因此提供了用于修改太阳能电池中的电荷选择性界面的新路径，以及更好地理解介孔系统中的行为。
英文摘要：
Methylammonium lead iodide (MAPI) is the archetype of the intensively researched class of perovskites for photovoltaics. Nonetheless, even equilibrium aspects are far from being fully understood. Here we discuss equilibrium space charge effects at the MAPI/TiO2 and MAPI/Al2O3 interfaces, which are of paramount significance for solar cells. Different from the photovoltaic literature in which such built-in potentials are considered as being generated solely by electronic charge carriers, we will apply a generalized picture that considers the equilibrium distribution of both ionic and electronic carriers. We give experimental evidences that it is the ions that are responsible for the equilibrium space charge potential in MAPI, the reason being a pronounced ion adsorption at the contacts. The occurrence of equilibrium space charge effects generated by ionic redistribution has not been considered for photovoltaic materials and as such provides a novel path for modifying charge-selective interfaces in solar cells, as well as a better understanding of the behavior in mesoporous systems.
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