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How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells
Solar RRL ( IF 7.9 ) Pub Date : 2020-09-11 , DOI: 10.1002/solr.202000382 Esma Ugur 1 , Erkki Alarousu 1 , Jafar I. Khan 1 , Aleš Vlk 2 , Erkan Aydin 1 , Michele De Bastiani 1 , Ahmed H. Balawi 1 , Sandra P. Gonzalez Lopez 1 , Martin Ledinský 2 , Stefaan De Wolf 1 , Frédéric Laquai 1
Solar RRL ( IF 7.9 ) Pub Date : 2020-09-11 , DOI: 10.1002/solr.202000382 Esma Ugur 1 , Erkki Alarousu 1 , Jafar I. Khan 1 , Aleš Vlk 2 , Erkan Aydin 1 , Michele De Bastiani 1 , Ahmed H. Balawi 1 , Sandra P. Gonzalez Lopez 1 , Martin Ledinský 2 , Stefaan De Wolf 1 , Frédéric Laquai 1
Affiliation
Metal halide perovskites exhibit outstanding optical and electronic properties, but are very sensitive to humidity and light‐soaking. In this work, the photophysics of perovskites that have been exposed to such conditions are studied and, in this context, the impact of excess lead iodide (PbI2) is revealed. For exposed samples, the formation of subbandgap states and increased trap‐assisted recombination is observed, using highly sensitive absorption and time‐resolved photoluminescence (TRPL) measurements, respectively. It appears that such exposure primarily affects the perovskite surface. Consequently, on n–i–p device level, the spiro‐OMeTAD/perovskite interface is more rapidly affected than its buried electron‐collecting interface. Moreover, both stoichiometric and nonstoichiometric MAPbI3‐based solar cells show reduced device performance mainly due to voltage losses. Overall, this study brings forward key points to consider in engineering perovskite solar cells with improved performance and material stability.
中文翻译:
湿度和光照如何改变金属卤化物钙钛矿太阳能电池的光物理性质
钙钛矿金属卤化物具有出色的光学和电子性能,但对湿度和光吸收非常敏感。在这项工作中,研究了暴露于这种条件下的钙钛矿的光物理性质,并在此背景下,揭示了过量碘化铅(PbI 2)的影响。对于暴露的样品,分别使用高灵敏度吸收和时间分辨光致发光(TRPL)测量,观察到了亚带隙态的形成和陷阱辅助重组的增加。看来这种暴露主要影响钙钛矿表面。因此,在n–i–p器件级别上,spiro-OMeTAD /钙钛矿界面比其埋藏的电子收集界面受到的影响更快。此外,化学计量和非化学计量的MAPbI 3的太阳能电池主要由于电压损失而导致器件性能下降。总的来说,这项研究提出了在工程钙钛矿太阳能电池中要考虑的关键点,这些电池具有改善的性能和材料稳定性。
更新日期:2020-11-06
中文翻译:
湿度和光照如何改变金属卤化物钙钛矿太阳能电池的光物理性质
钙钛矿金属卤化物具有出色的光学和电子性能,但对湿度和光吸收非常敏感。在这项工作中,研究了暴露于这种条件下的钙钛矿的光物理性质,并在此背景下,揭示了过量碘化铅(PbI 2)的影响。对于暴露的样品,分别使用高灵敏度吸收和时间分辨光致发光(TRPL)测量,观察到了亚带隙态的形成和陷阱辅助重组的增加。看来这种暴露主要影响钙钛矿表面。因此,在n–i–p器件级别上,spiro-OMeTAD /钙钛矿界面比其埋藏的电子收集界面受到的影响更快。此外,化学计量和非化学计量的MAPbI 3的太阳能电池主要由于电压损失而导致器件性能下降。总的来说,这项研究提出了在工程钙钛矿太阳能电池中要考虑的关键点,这些电池具有改善的性能和材料稳定性。