Parası kalmadığı için otobüse binemiyordur ailesi porno izle ona daha yeni para gönderdiği için tekrar porno istemeye utanınca mecburen otostop çekmek için youporn çantasını alarak yol kenarına gelir etekli porno liseli türk kız yol kenarında dururken yanına yaklaşan porno kibar bir gencin onu gideceği yere kadar bırakmak porno izle istemesine çok mutlu olur arabaya bindiklerinde gideceği yer ile porno arabayı kullanan adamın gittiği yer arasında çok mesafe sex izle farkı olduğunu anlayan türk kız bu yaptığı porno indir iyilik karşısında arabada ona memelerini açar porno sapıklaşan adam yol kenarındaki hotelde durarak porno izle üniversiteli otostop çeken türk kızına odada sakso çektirip sikerThe role of graphene-doped PEDOT:PSS as hole transporting layer in inverted perovskite solar cells| Abstract

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Abstract

The role of graphene-doped PEDOT:PSS as hole transporting layer in inverted perovskite solar cells

Author(s): Teresa S. Ripolles, C. Redondo-Obispo, A. L. lvarez, C. Coya, S. Cortijo-Campos, A. de Andrs and E. Climent-Pascual

The undesirable reactions from poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS), which presents hygroscopic and acid character of PSS- group, reduces drastically the stability and efficiency of inverted perovskite solar cells. We developed a facile synthesis method of graphene platelets into PEDOT:PSS solution in order to block these unstable reactions. The homogenous graphene-doped PEDOT:PSS layer show up to 10 times improvements on its conductivity, maintaining high optical transmittance. Additionally, the standard CH3NH3PbI3 film grown on graphene-doped PEDOT:PSS layer exhibits large perovskite crystallite size and a reduction of PbI2 content, leading high stability over time. The hydrophobic character of graphene probably blocks undesirable reactions hampering degradation. The inverted perovskite solar cells based on graphene-doped PEDOT:PSS as hole transport layer show better photovoltaic parameters by increasing charge extraction analyzed by impedance spectroscopy. This simple and low-cost preparation method leads to a successful candidate to synthetize effective hole transport layer to be considered in optoelectronic devices.


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