Enlarging grain sizes for efficient perovskite solar cells by methylamine chloride assisted recrystallization

Highly Efficient and Stable CsPbTh3 (Th = I, Br, Cl) Perovskite Solar Cells by Combinational Passivation Strategy

“…[51] As shown in Table S2 (Supporting Information), the average carrier lifetime of the CsPbTh 3 film is increased from 15.36 to 27.74 ns by the CPS, suggesting that the reduced carrier recombination rate occurred in perovskite film with CPS. [52] To further explore ultrafast photoexcited carrier dynamics of CPS-CsPbTh 3 film, the characterization of femtosecond transient absorption (TA) spectroscopy was carried out. As shown in S3 (Supporting Information)).…”

“…[ 51 ] As shown in Table S2 (Supporting Information), the average carrier lifetime of the CsPbTh 3 film is increased from 15.36 to 27.74 ns by the CPS, suggesting that the reduced carrier recombination rate occurred in perovskite film with CPS. [ 52 ]…”

Ionic Liquids Modulating CsPbI3 Colloidal Quantum Dots Enable Improved Mobility for High-Performance Solar Cells

“…As presented in Figure a, for PQD solutions, the absorption cutoff edge has a slight blueshift when [Pmim]I is added, which could have resulted from the improved defect passivation of PQDs according to the previous reports. , For the solid PQD films prepared for solar cells, the [Pmim]­I-PQDs film exhibits a slight redshift in the absorption onset compared to the pristine PQDs films. This shift could be considered as a result of the enhanced electronic coupling between neighboring PQDs. ,,,, In steady-state photoluminescence (PL) spectra as shown in Figure a,b, the significant increase in the PL peak intensity for both the [Pmim]­I-PQDs solution and film suggests that the [Pmim]I treatment leads to a reduction of nonradiative recombination pathways by lowering the trap state density of the PQD film. , The powerful proof for the reduction of defect states is given by the time-resolved photoluminescence (TRPL) decay spectra (Figure c), and the parameters drawn from the fitted decay curves with a biexponential function are summarized in Table . , The [Pmim]­I-PQDs film shows nearly two-times slower PL lifetime as compared to the control film, which indicates the effective defect passivation by [Pmim]I IL.…”

“…18,19 The powerful proof for the reduction of defect states is given by the time-resolved photoluminescence (TRPL) decay spectra (Figure 3c), and the parameters drawn from the fitted decay curves with a biexponential function are summarized in Table 1. 45,46 The [Pmim]I-PQDs film shows nearly two-times slower PL lifetime as compared to the control film, which indicates the effective defect passivation by [Pmim] I IL.…”

In Situ Methylammonium Chloride-Assisted Perovskite Crystallization Strategy for High-Performance Solar Cells

“…Like other kinds of thin-film solar cells, the optoelectronic properties of perovskite materials are highly dependent on their film quality. So far, many approaches have been introduced, such as composition engineering, solvent engineering, interfacial modification, additive regulation, and film-casting processing, − to achieve high-quality perovskite layers, which are critical factor to achieving high-performance PSCs. Additive engineering of perovskite precursors has been proven to be an effective approach for delivering homogeneous nucleation or regulating the crystallization kinetics of perovskite films. − Among the different additives, chlorine-based additives have been demonstrated to be suitable for controlling and improving the perovskite film morphology as well as suppressing the bulk defects to obtain high-performance solar cells. ,, In this regard, methylammonium chloride (MACl) and lead chloride (PbCl 2 ) have attracted a lot of attention due to the chloride ion in their composition, which could retard the crystallization and improve the quality of the perovskite films. , In 2013, Stranks et al showed that the chlorine-containing perovskite could extend the carrier diffusion lengths to 1 μm.…”