<br>新型 TiO2 纳米棒的选择性控制：介观钙钛矿太阳能电池电子传输层的优异构建模块,ACS Applied Materials & Interfaces

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新型 TiO2 纳米棒的选择性控制：介观钙钛矿太阳能电池电子传输层的优异构建模块
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-02-08 , DOI: 10.1021/acsami.2c21731
You Jin Park ₁ , Young In Jeon ₁ , In Seok Yang ₁ , Hyunsue Choo ₁ , Woo Seok Suh ₁ , So-Yeon Ju ₁ , Hui-Seon Kim ₁ , Jia Hong Pan ₂ , Wan In Lee ₁

Affiliation

在碱性环境下通过溶剂热反应选择性合成了70-200 nm不同长度和46-48 nm均匀宽度的新型TiO ₂纳米棒（NR）。 TiO ₂ NR 的长度可通过改变四甲基氢氧化铵 (TMAH) 的浓度进行可重复调节，而纯锐钛矿相中的 NR 则沿 [001] 方向生长，这是由于 TMAH 与 TiO ₂的优先结合亲和力所致（ 101) 方面。然后应用不同长度的TiO ₂ NR来形成介观钙钛矿太阳能电池（PSC）的电子传输层（ETL）。我们发现，具有 NR 的 PSC 器件表现出比具有传统 46 nm 尺寸 TiO ₂纳米颗粒 (NP46) 的 PSC 器件更优异的光伏 (PV) 性能。特别是，具有110 nm长度的TiO ₂ NR（NR110）的PSC表现出最佳的PV转换效率（PCE）：平均PCE为22.64％ _， VOC为1.137 V， J _SC为24.60 mA·cm ^–2 ， FF为80.96%，而冠军PCE为23.18%。此外，含有 NR110 的 PSC (PSC-NR110) 在相对湿度为 40-50% 的空气中显着提高了长期稳定性。在 1000 小时内，其 PCE 仅降低 9%，而含有 NP46 的 PSC 则降低 25%。在黑暗条件下和不同光强度下通过阻抗谱和J - V曲线测量分析的 PSC 特性提供了证据，表明 PSC-NR110 的缺陷较少，并且电荷复合显着减少。我们讨论了 NR 结构在制备 PSC 器件 ETL 中的优势，并解释了为什么电荷复合受到抑制。

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Selective Control of Novel TiO2 Nanorods: Excellent Building Blocks for the Electron Transport Layer of Mesoscopic Perovskite Solar Cells

Novel TiO₂ nanorods (NRs) with various lengths of 70–200 nm and uniform widths of 46–48 nm are selectively synthesized by a solvothermal reaction under a basic environment. The length of TiO₂ NRs is reproducibly tuned by varying the concentration of tetramethylammonium hydroxide (TMAH), while the NRs in the pure anatase phase are grown in the [001] direction, caused by the preferential binding affinity of TMAH to the TiO₂ (101) facet. TiO₂ NRs of various lengths are then applied to form the electron transporting layer (ETL) of mesoscopic perovskite solar cells (PSCs). We found that PSC devices with NRs exhibit superior photovoltaic (PV) performance to those with conventional 46 nm-sized TiO₂ nanoparticles (NP46). Particularly, the PSC with TiO₂ NRs of 110 nm length (NR110) exhibits the optimum PV conversion efficiency (PCE): the average PCE is 22.64% with a V_OC of 1.137 V, a J_SC of 24.60 mA·cm^–2, and a FF of 80.96%, while the champion PCE is 23.18%. In addition, the PSC with NR110 (PSC-NR110) reveals significantly improved long-term stability in air with a relative humidity of 40–50%. In 1000 h, its PCE is reduced by only 9% whereas that of PSC with NP46 decreases by 25%. The PSC properties analyzed by impedance spectroscopy and J–V curve measurements under dark conditions and at various light intensities provide evidence that PSC-NR110 has fewer defects and shows significantly reduced charge recombination. We discuss the advantages of NR structures in preparing the ETL of PSC devices and also explain why the charge recombination is suppressed.

更新日期：2023-02-08

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