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首页> 外文期刊>Organic Electronics >Enhanced efficiency and stability of inverted perovskite solar cells by carbon dots cathode interlayer via solution process
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Enhanced efficiency and stability of inverted perovskite solar cells by carbon dots cathode interlayer via solution process

机译：碳点阴极中间层通过固溶工艺提高了倒钙钛矿太阳能电池的效率和稳定性

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摘要

Interfacial engineering has been widely recognized as among the most effective approaches to deriving high performance perovskite solar cells (PSCs). [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) and silver (Ag) were extensively used as the electron transport material and cathode material in the inverted device. However, the energy level mismatch between PC61BM and Ag cathode has a possibility to severely affect the electron extraction and transportation. Hereby, only alcohol-soluble carbon dots (CDs) were synthesized and applied as a cathode interlayer (CIL) through a simple solution-process to make alteration to the interface between PC61BM and Ag in inverted PSCs, the PC61BM/CDs layer was generated with low trap-state density, high electrical conductivity, high electron mobility and appropriate energy level. Finally, the inverted device with the CDs CIL exhibited a power conversion efficiency (PCE) of 17.34% with the steady-state output PCE reaching 16.96%. The stability of devices was also enhanced due to the hydrophobicity of the CDs cathode interlayer. The efficiency of inverted PSCs with PC61BM/CDs layer remained 70% of the initial PCE under dry condition after 40 days versus only 20% of the initial PCE for the PCBM ETL without CDs.
机译：界面工程已被公认为是获得高性能钙钛矿太阳能电池（PSC）的最有效方法之一。 [6,6]-苯基-C61-丁酸甲酯（PC61BM）和银（Ag）被广泛用作倒装器件中的电子传输材料和阴极材料。但是，PC61BM与Ag阴极之间的能级不匹配可能会严重影响电子的提取和传输。因此，仅合成了可溶于醇的碳点（CDs）并通过简单的固溶工艺将其用作阴极夹层（CIL），以改变反相PSC中PC61BM和Ag之间的界面，生成PC61BM / CDs层低陷阱态密度，高电导率，高电子迁移率和适当的能级。最后，带有CD CIL的倒装器件的功率转换效率（PCE）为17.34％，稳态输出PCE达到16.96％。由于CDs阴极夹层的疏水性，器件的稳定性也得到了提高。 40天后，在干燥条件下，具有PC61BM / CDs层的倒置PSC的效率仍为初始PCE的70％，而没有CD的PCBM ETL的效率仅为初始PCE的20％。

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