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Efficient and stable mesoporous perovskite solar cells using p-type poly (9-vinylcarbazole) modified the interface of perovskite/mesoporous TiO2 layers
Organic Electronics ( IF 3.2 ) Pub Date : 2020-03-25 , DOI: 10.1016/j.orgel.2020.105737
Jiaji Duan , Yuning Liu , Xiaohong Chen , Sumei Huang , Wei Ou-Yang , Guang Zhu , Sanjun Zhang , Zhuo Sun

A p-type poly(9-vinylcarbazole) (PVC) was inserted into the interface between perovskite and mesoporous TiO2 electron transport layers. The ultrathin PVC modified TiO2 layer can obviously improve the crystallinity of perovskite layer with less pinholes, passivate the interface and inhibit hole carriers transport into the interface of perovskite/TiO2 electron transport layers. The perovskite film modified with PVC shows larger grain sizes and more compact films, which helps to increase photocurrent and reduce the leak current of cells. The passivating interface with less hole carrier accumulation and hydrophobicity can greatly reduce carrier recombination, improve carrier transport and extraction abilities and cells stability. Therefore, perovskite solar cells (PSCs) with PVC modified TiO2 layer exhibited a power conversion efficiency (PCE) of 19.02%, which is remarkably higher than that (16.09%) of the reference cells. Furthermore, PSCs without and with PVC modification respectively retained 20% and 55% of the initial PCE values aging for 30 days at the relative humidity 15% in air without encapsulation. For thermal stability test, the pervoskite layers were heated for 10 h at 100 °C before further spin-coating Spiro-OMeTAD, PSCs with PVC modification were still remained 70% of the original PCEs, which is greatly higher than that (30%) of the reference cells. These results indicate that PSCs with PVC modified TiO2 layer can effectively improve PCEs and show better moisture resistance and thermal stability.



中文翻译:

使用p型聚(9-乙烯基咔唑)的高效,稳定的介孔钙钛矿太阳能电池改性了钙钛矿/介孔TiO 2层的界面

将p型聚(9-乙烯基咔唑)(PVC)插入钙钛矿和介孔TiO 2电子传输层之间的界面。PVC改性的超薄TiO 2层可显着提高钙钛矿层的结晶度,减少针孔,钝化界面并抑制空穴载流子迁移进入钙钛矿/ TiO 2界面电子传输层。用PVC改性的钙钛矿薄膜显示出更大的晶粒尺寸和更致密的薄膜,这有助于增加光电流并减少电池的泄漏电流。具有较少的空穴载流子积累和疏水性的钝化界面可以大大减少载流子的重组,提高载流子的迁移和提取能力以及细胞稳定性。因此,具有PVC改性TiO 2的钙钛矿太阳能电池(PSC)层的功率转换效率(PCE)为19.02%,明显高于参考电池的功率转换效率(16.09%)。此外,未经改性和经过PVC改性的PSC在空气中的相对湿度为15%且未封装的情况下,在20天和55%的初始PCE值下老化30天分别保持30天。为了进行热稳定性测试,在进一步旋涂Spiro-OMeTAD之前,将白云母层在100°C下加热10 h,用PVC改性的PSC仍然保持原始PCE的70%,这大大高于(30%)参考单元格。这些结果表明,具有PVC改性的TiO 2层的PSC可以有效地改善PCE,并显示出更好的耐湿性和热稳定性。

更新日期:2020-03-26
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