Improving the Performance of Inverted Formamidinium Tin Iodide Perovskite Solar Cells by Reducing the Energy-Level Mismatch,ACS Energy Letters

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Improving the Performance of Inverted Formamidinium Tin Iodide Perovskite Solar Cells by Reducing the Energy-Level Mismatch
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-04-11 00:00:00 , DOI: 10.1021/acsenergylett.8b00383
Xiao Liu _{1,

2} , Yanbo Wang ₂ , Fengxian Xie ₁ , Xudong Yang ₂ , Liyuan Han _{1,

2}

Affiliation

A new hole-transport layer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate (PEDOT:PSS) with intercalated polyethylene glycol (PEG), was introduced into Pb-free inverted formamidinium tin triiodide (FASnI₃) perovskite solar cells to reduce the energy-level mismatch between FASnI₃ and PEDOT:PSS. Intercalation of PEG into the PEDOT:PSS enhanced the power conversion efficiency from 2.01 to 5.12% in the forward scan and resulted in high reproducibility. The device based on PEG-PEDOT:PSS showed a reduced hysteresis and a stabilized efficiency of 4.91%. Finally, the devices with the new hole-transport layer retained more than 90 and 95% of their initial power conversion efficiencies upon storage in, respectively, an ambient environment for 4 h and a N₂ environment for 30 days. These findings suggest that this new material will facilitate the development of environmentally friendly Pb-free perovskite solar cells for real-world applications.

中文翻译：

通过减少能级不匹配来提高反转的甲ami碘化钙钛矿型钙钛矿太阳能电池的性能

将一种新的空穴传输层，即带嵌入聚乙二醇（PEG）的聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS），引入无铅的倒三碘化三碘化锡（FASnI ₃）钙钛矿太阳能电池中，减少FASnI ₃和PEDOT：PSS之间的能级不匹配PEG插入PEDOT：PSS的能力在正向扫描中将功率转换效率从2.01提高到5.12％，并具有很高的重现性。 PSS的磁滞降低了，效率稳定了4.91％，最后，具有新的空穴传输层的器件在环境中分别存储4小时和90分钟后，其初始功率转换效率分别保持了90％和95％以上。 N ₂环境30天。这些发现表明，这种新材料将促进针对实际应用的环保型无铅钙钛矿太阳能电池的开发。

更新日期：2018-04-11

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