Synthesis and Characterization of Spinel Cobaltite (Co3O4) Thin Films for Function as Hole Transport Materials in Organometallic Halide Perovskite Solar Cells,ACS Applied Energy Materials

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Synthesis and Characterization of Spinel Cobaltite (Co3O4) Thin Films for Function as Hole Transport Materials in Organometallic Halide Perovskite Solar Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-18 00:00:00 , DOI: 10.1021/acsaem.0c00230
Yaqi Zhang _{1,

2,

3} , Jie Ge ₁ , Behzad Mahmoudi ₄ , Stefan Förster ₁ , Frank Syrowatka ₅ , A. Wouter Maijenburg ₄ , Roland Scheer ₁

Affiliation

Conventional inorganic p-type conductive oxides, for example, NiO, CuO_X, and CuCrO_X, can serve as low-cost and efficient hole transport materials for wide-bandgap organolead halide perovskites [for example, MAPbI₃] but fail for low-bandgap Sn-rich organometallic perovskites, for example, (FASnI₃)_0.6(MAPbI₃)_0.4, where MA = (CH₃NH₃) and FA = (HC(NH₂)₂). In this work, we explore spinel Co₃O₄-based p-type conductive oxides as hole transport materials in organometallic halide MAPbI₃ and (FASnI₃)_0.6(MAPbI₃)_0.4 perovskite solar cells. We examine the structural, crystalline, optical, electrical, photo-electrochemical, and surface chemistry properties of spin-coated Co₃O₄ films without and with lithium doping. We find that lithium doping improves hole mobilities and film optical transparency and causes a lithium-enriched overlayer (e.g., LiCoO₂) forming at the Co₃O₄ film surface. As a result, lithium doping can maximize the hole transport properties of Co₃O₄ in our inverted planar perovskite solar cells, achieving about 14 and 7% light-to-electricity power conversion efficiencies (PCEs) for perovskite halides MAPbI₃ and (FASnI₃)_0.6(MAPbI₃)_0.4, respectively. This work underscores that cobaltite spinels hold promise for application as working HTLs for all kinds of organometallic halide perovskites.

中文翻译：

用作金属有机卤化物钙钛矿太阳能电池中空穴传输材料的尖晶石型钴酸钴（Co ₃ O ₄）薄膜的合成与表征

传统的无机p型导电氧化物，例如NiO，CuO _X和CuCrO _X，可以用作宽带隙有机铅卤化物钙钛矿的低成本高效空穴传输材料[例如MAPbI ₃ ]，但对于带隙富锡的有机金属钙钛矿，例如（FASnI ₃）_0.6（MAPbI ₃）_0.4，其中MA =（CH ₃ NH ₃）和FA =（HC（NH ₂）₂）。在这项工作中，我们探索了尖晶石Co ₃ O ₄基p型导电氧化物作为有机金属卤化物MAPbI _3中的空穴传输材料。（FASnI ₃）_0.6（MAPbI ₃）_0.4钙钛矿太阳能电池。我们研究了在没有和有锂掺杂的情况下旋涂Co ₃ O ₄膜的结构，晶体，光学，电，光电化学和表面化学性质。我们发现锂掺杂改善了空穴迁移率和膜的光学透明度，并导致在Co ₃ O ₄膜表面形成富锂的覆盖层（例如LiCoO ₂）。结果，锂掺杂可以使Co ₃ O ₄的空穴传输性能最大化。在我们倒置的平面钙钛矿太阳能电池中，钙钛矿卤化物MAPbI ₃和（FASnI ₃）_0.6（MAPbI ₃）_0.4分别达到约14和7％的光电功率转换效率（PCE）。这项工作强调了钴尖晶石有望作为适用于各种有机金属卤化物钙钛矿的有效HTL应用。

更新日期：2020-03-18

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