Oriented Quasi‐2D Perovskites for High Performance Optoelectronic Devices,Advanced Materials

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Oriented Quasi‐2D Perovskites for High Performance Optoelectronic Devices
Advanced Materials ( IF 27.4 ) Pub Date : 2018-10-21 , DOI: 10.1002/adma.201804771
Rong Yang ₁ , Renzhi Li ₁ , Yu Cao ₁ , Yingqiang Wei ₁ , Yanfeng Miao ₁ , Wen Liang Tan ₂ , Xuechen Jiao _{2,

3} , Hong Chen ₁ , Liangdong Zhang ₁ , Qing Chen ₁ , Huotian Zhang ₄ , Wei Zou ₁ , Yuming Wang ₄ , Ming Yang ₁ , Chang Yi ₁ , Nana Wang ₁ , Feng Gao ₄ , Christopher R. McNeill ₂ , Tianshi Qin ₁ , Jianpu Wang ₁ , Wei Huang _{1,

5}

Affiliation

Quasi‐2D layered organometal halide perovskites have recently emerged as promising candidates for solar cells, because of their intrinsic stability compared to 3D analogs. However, relatively low power conversion efficiency (PCE) limits the application of 2D layered perovskites in photovoltaics, due to large energy band gap, high exciton binding energy, and poor interlayer charge transport. Here, efficient and water‐stable quasi‐2D perovskite solar cells with a peak PCE of 18.20% by using 3‐bromobenzylammonium iodide are demonstrated. The unencapsulated devices sustain over 82% of their initial efficiency after 2400 h under relative humidity of ≈40%, and show almost unchanged photovoltaic parameters after immersion into water for 60 s. The robust performance of perovskite solar cells results from the quasi‐2D perovskite films with hydrophobic nature and a high degree of electronic order and high crystallinity, which consists of both ordered large‐bandgap perovskites with the vertical growth in the bottom region and oriented small‐bandgap components in the top region. Moreover, due to the suppressed nonradiative recombination, the unencapsulated photovoltaic devices can work well as light‐emitting diodes (LEDs), exhibiting an external quantum efficiency of 3.85% and a long operational lifetime of ≈96 h at a high current density of 200 mA cm⁻² in air.

中文翻译：

面向高性能光电器件的准2D钙钛矿

准2D层状有机金属卤化物钙钛矿最近因其与3D类似物的内在稳定性而成为太阳能电池的有希望的候选物。然而，由于大的能带隙，高的激子结合能和差的层间电荷传输，相对较低的功率转换效率（PCE）限制了二维层状钙钛矿在光伏中的应用。在此，通过使用3-溴苄基碘化铵，证明了高效，水稳定的准二维钙钛矿型太阳能电池，其PCE峰值为18.20％。在约40％的相对湿度下2400小时后，未封装的器件可维持其初始效率的82％以上，并且在浸入水中60 s后仍显示出几乎不变的光伏参数。钙钛矿太阳能电池的强大性能来自具有疏水性，高度电子有序性和高结晶度的准2D钙钛矿薄膜，其由底部垂直生长的取向大带隙钙钛矿和定向取向的小带隙钙钛矿组成。带隙成分在顶部区域。此外，由于抑制了非辐射复合，因此未封装的光伏器件可以很好地用作发光二极管（LED），在200 mA的高电流密度下表现出3.85％的外部量子效率和≈96h的长使用寿命厘米空气中⁻²。

更新日期：2018-10-21

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