Enhanced Charge Transfer in Atom‐Thick 2H–WS2 Nanosheets’ Electron Transport Layers of Perovskite Solar Cells,Solar RRL

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Enhanced Charge Transfer in Atom‐Thick 2H–WS2 Nanosheets’ Electron Transport Layers of Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-08-02 , DOI: 10.1002/solr.202000260
Nurul Ain Abd Malek ₁ , Nabilah Alias ₁ , Akrajas Ali Umar ₁ , Xin Zhang ₂ , Xiaoguo Li ₃ , Siti Khatijah Md Saad ₁ , Nur Adliha Abdullah ₁ , Haijuan Zhang ₃ , Zhenhua Weng ₃ , Zejiao Shi ₃ , Chongyuan Li ₃ , Mohd Mustaqim Rosli ₁ , Yiqiang Zhan _{2,

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Affiliation

The structure and the electronic properties of the electron‐transport layer (ETL) of perovskite solar cells (PSCs) govern the interfacial charge transfer and charge transportation to the electrode. The ETLs of two dimensions, that are atom thick, and have a planar structure that possesses special electronic properties, such as the surface collective motion of excitons or charge transfer–driven defect state relief, that is 2D transition metal dichalcogenide, allow a highly energetic carrier dynamic process for enhanced photovoltaic effect. Herein, it is discovered that planar, few‐atom‐thick 2H–WS₂ nanosheets' ETLs drive ultrafast charge transfer and transportation along the ETL during the photovoltaic process. Time‐resolved photoluminescence and electrochemical impedance spectroscopy analysis results indicate that the charge transfer from the perovskite to the ETL occurs as fast as 5.9 ns with charge transfer resistance as low as 25.6 Ω. This allows the PSC device to produce a power conversion efficiency of 18.21% with short‐circuit current density, open‐circuit voltage, and fill factor as high as 22.24 mA cm², 1.12 V, and 0.731, respectively. The PSC retains 96.87% of its performance when being aged in nitrogen atmosphere for 33 days. Atom‐thick planar WS₂ ETL nanosheets can be the basis for the development of high‐performance PSC devices.

中文翻译：

钙钛矿型太阳能电池的原子厚2H-WS2纳米片的电子传输层中增强的电荷转移

钙钛矿太阳能电池（PSC）的电子传输层（ETL）的结构和电子性质决定着界面电荷的转移和向电极的电荷转移。二维的ETL，原子厚，具有具有特殊电子特性的平面结构，例如激子的表面集体运动或电荷转移驱动的缺陷态消除，即2D过渡金属二硫化二氢，具有很高的能量载流子动态过程可增强光伏效应。在这里，我们发现平面的，原子厚度较小的2H–WS ₂纳米片的ETL在光伏过程中驱动超快的电荷沿着ETL进行转移和运输。时间分辨的光致发光和电化学阻抗谱分析结果表明，从钙钛矿到ETL的电荷转移速度最快为5.9 ns，而电荷转移电阻低至25.6Ω。这允许PSC设备产生的18.21％与短路电流密度，开路电压和填充因子高达22.24毫安厘米的功率转换效率²分别，1.12 V，和0.731。在氮气气氛中老化33天后，PSC保留了其96.87％的性能。原子厚的平面WS ₂ ETL纳米片可以作为高性能PSC器件开发的基础。

更新日期：2020-10-06

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