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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.17: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1A

Enhancing the Open-Circuit Voltage of Inverted Perovskite Solar Cells via Post Treatment Precursor Engineering — •Zekarias Teklu, Shahidul Alam, Steffi Stumpf, Ulrich S. Schubert, and Harald Hoppe — Friedrich Schiller University Jena, Germany

We develop a method of precursor engineering to prepare high-quality perovskite film and its stable PSC with enhanced Voc based on PbAc2 and MAI. The precursor engineering process is done through simple post-treating on pure MAPbI3 host film with (MABr, FABr and FAIsolutions resulted in the formation of mixed cation and or mixed anion of MAPbI3-xBrx, FAxMA1-xPbI3-xBrx,and FAxMA1-xPbI3 perovskites respectively. This post treatment step leads to increased crystal grain dimension, compact and uniform morphology. The dipolar molecules of MABr, FABr, and FAI can simultaneously passivate both cationic and anionic defects of MAPbI3 perovskite films and reduced the defects density, non-radiative recombination and electronic disorder, which are responsible for the Voc reduction. With the post engineering precursor modification, we have developed, the device Voc is enhanced markedly from 0.5 V to 1.08 V of average. The optimized device based on the FAxMA1-xPbI3 obtained from the cation intermixing engineering of FAI on MAPbI3 film shows a promising power conversion efficiency of 16%. As compared to conventional passivation approaches, by using anti-solvent engineering and fast crystallization, which are typically carried out at difficult and short time windows. Our post-treatment process can be easily done on the already crystallized perovskite film.