Self-Functionalization Behind a Solution-Processed NiOx Film Used As Hole Transporting Layer for Efficient Perovskite Solar Cells.
Self-Functionalization Behind a Solution-Processed NiOx Film Used As Hole Transporting Layer for Efficient Perovskite Solar Cells.
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DOI：
10.1021/acsami.6b15975
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发表时间：
2017-03
影响因子：
9.5
通讯作者：
John Ciro;D. Ramírez;Mario Alejandro Mejía Escobar;J. Montoya;Santiago Mesa;R. Betancur;F. Jaramillo-F.-Jara
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文献类型：
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作者：
John Ciro;D. Ramírez;Mario Alejandro Mejía Escobar;J. Montoya;Santiago Mesa;R. Betancur;F. Jaramillo-F.-Jara
溶液加工钙钛矿太阳能电池（PSC）的制造需要用前驱体油墨沉积高质量的薄膜。 PSC 的缓冲层通常由金属氧化物纳米颗粒 (NP) 的分散体形成。因此，开发可靠的方法来制备稳定的胶体纳米粒子分散体至关重要。在这项工作中，提出了一种形成具有合适光电特性的非常紧凑的半导体缓冲层的新方法，通过纳米晶颗粒自身的非晶相的自功能化过程，并且不添加任何其他无机或有机功能化组分或表面活性剂。这种由残余硝酸根、氢氧根和钠离子组成的互连非晶相被证明是获得稳定的胶体分散体的基础，并有助于在最终薄膜中组装单独的结晶氧化镍纳米颗粒，从而形成非常均匀和致密的层。揭示了纳米颗粒高度稳定背后的拟议机制。最后，自功能化氧化镍层表现出高光电特性，使钙钛矿 p-i-n 太阳能电池的效率高达 16.6%，证明了所提出的策略在室温下在溶液中获得高质量缓冲层的相关性。
Fabrication of solution-processed perovskite solar cells (PSCs) requires the deposition of high quality films from precursor inks. Frequently, buffer layers of PSCs are formed from dispersions of metal oxide nanoparticles (NPs). Therefore, the development of trustable methods for the preparation of stable colloidal NPs dispersions is crucial. In this work, a novel approach to form very compact semiconducting buffer layers with suitable optoelectronic properties is presented through a self-functionalization process of the nanocrystalline particles by their own amorphous phase and without adding any other inorganic or organic functionalization component or surfactant. Such interconnecting amorphous phase composed by residual nitrate, hydroxide, and sodium ions, proved to be fundamental to reach stable colloidal dispersions and contribute to assemble the separate crystalline nickel oxide NPs in the final film, resulting in a very homogeneous and compact layer. A proposed mechanism behind the great stabilization of the nanoparticles is exposed. At the end, the self-functionalized nickel oxide layer exhibited high optoelectronic properties enabling perovskite p-i-n solar cells as efficient as 16.6% demonstrating the pertinence of the presented strategy to obtain high quality buffer layers processed in solution at room temperature.