Journal article
(Original article)


Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells


Publication Details
Author(s): Levchuk I, Hou Y, Gruber M, Brandl M, Herre P, Tang X, Högl F, Batentschuk M, Osvet A, Hock R, Peukert W, Tykwinski R, Brabec C
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
Publication year: 2016
ISSN: 2196-7350
Language: English

Abstract

Solution-based perovskite solar cell fabrication typically involves rather complex processing sequences to yield highest performance. While most studies concentrate on the exploration of processing conditions, the purity levels of common perovskite precursor solutions have been investigated and a number of impurities that are critically important toward controlling the crystallization of perovskites are found. In this study, an in-depth chemical study of the possible impurities formed during CHNHI preparation is presented and their relevance on solar cell processing is revealed. A primary consideration is the chemical transformation of hypophosphorous acid, which plays the role of the stabilizer for HI. The detrimental role of the impurities is best demonstrated by comparing perovskite solar cell devices fabricated from impurity-free precursors versus precursors containing different concentrations of impurities. Most interestingly, it is revealed that a certain concentration of impurities is detrimental to the growth of large-grained crystals. PbHPO nanoparticles, which are formed after hypophosphorous acid transformation, actually cause crystal domain growth through serving as a nucleation center. This study gives valuable insight into the rate determining steps of perovskite crystal growth and further provides the basis for developing reliable and reproducible high-performance recipes for perovskite solar cell processing.



FAU Authors / FAU Editors


How to cite
APA: Levchuk, I., Hou, Y., Gruber, M., Brandl, M., Herre, P., Tang, X.,... Brabec, C. (2016). Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells. Advanced Materials Interfaces. https://dx.doi.org/10.1002/admi.201600593

MLA: Levchuk, Ievgen, et al. "Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells." Advanced Materials Interfaces (2016).

BibTeX: Download
Share link
Last updated on 2017-09-23 at 03:36
PDF downloaded successfully