A Nonionic and Low-Entropic MA(MMA)nPbI3-Ink for Fast Crystallization of Perovskite Thin Films

Abstract

A nonionic ink has been developed to facilitate rapid crystallization of perovskite with high film quality including strong crystal orientation and carrier diffusion length that reaches the single-crystal level. Solar cells based on this ink show an invariant efficiency over 21% regardless of the device area ranging from 0.096 to 0.5 cm 2 .

Self‐Powered Red/UV Narrowband Photodetector by Unbalanced Charge Carrier Transport Strategy

“…[ 38 ] Prior studies have also revealed that in a HOIP perovskite system, varying the ratio of inorganic to organic precursor will lead to an obvious self‐doping behavior. [ 45 ] Building upon the prior self‐doping strategies [ 45,46 ] and our recent reports of nonionic HOIP ink, [ 47,48 ] here we have developed a p‐type self‐doped mixed‐halide perovskite, p‐MAPbI 2 Br. It should be noted that the fabrication method based upon nonionic HOIP ink enables the realization of perovskite film with high texturing (Lotgering factor of 0.89) and homogeneity.…”

“…It should be noted that the fabrication method based upon nonionic HOIP ink enables the realization of perovskite film with high texturing (Lotgering factor of 0.89) and homogeneity. [ 47 ] This is a result of self‐assembly of perovskite intermediate in the nonionic ink precursor solution, which has a highly ordered layered structure that facilitates crystallization and film assembly. [ 47,49 ] This method is also compatible with the layer‐by‐layer device fabrication process.…”

“…[ 47 ] This is a result of self‐assembly of perovskite intermediate in the nonionic ink precursor solution, which has a highly ordered layered structure that facilitates crystallization and film assembly. [ 47,49 ] This method is also compatible with the layer‐by‐layer device fabrication process. Figure A (i–v) illustrate the process of synthesizing a p‐type self‐doped MAPbI 2 Br HOIP film.…”

“…[ 50,51 ] It is noted that the film shows strong orientation preference along (110) and (220) planes, which is commonly observed in the perovskite films fabricated using the same method in prior studies. [ 47,49,52 ] The mixed halide perovskite MAPb(I x Br 1− x ) 3 usually suffers from phase segregation into I‐rich (MAPbI 3 ) and Br‐rich (MAPbBr 3 ) domain, which can be identified through XRD peak splitting. [ 53,54 ] To verify the homogeneous single‐phase nature of the p‐MAPbI 2 Br film, the (110) peak of the film is studied in detail.…”

Solvent Engineering of the Precursor Solution toward Large‐Area Production of Perovskite Solar Cells

“…With these in mind, researchers have made great efforts on solvent engineering of perovskite precursor solution to balance the control of the film‐forming process and the reduction of the toxicity of solution‐processed perovskite film. So far, the advanced strategies of solvent engineering could be categorized into two major types, including regulation of coordination ability of solvent system (e.g., mixing of solvents with high D N with those with low D N ) [ 80–89 ] and reducing the toxicity of precursor solution (e.g., alcoholic, aqueous, and ionic liquids (ILs)‐based solvent) ( Figure ). [ 90–97 ]…”