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Experimental
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Method 1 - M1 - The standard perovskite precursor solutions were
prepared by dissolving MAI, PbI2 and PbCl2 in DMF to get 40wt% solution
(MAI:PbI2:PbCl2 - 4:1:1). 100 µL of precursor solution was spun onto the
substrate at 4000 rpm for 30 s, then dried at 100°C for 90 min. The MAPI
NCs dispersed in toluene was spun coated onto the above perovskite layer
at 4000 rpm for 30 s followed by annealing at 100°C for 2 min, forming
the perovskite/MAPI NCs film. In the reference perovskite film, no MAPI
NCs dispersed in toluene were spin coated on top.

Method 2 - M2 - The standard perovskite precursor solutions were
prepared by dissolving MAI and PbI2 in DMSO/GBL (3:7 vol ratio) to get
40wt% solution (MAI:PbI2 - 1:1). 100 µL of precursor solution was spun
onto the substrate at 5000 rpm for 50 s. At the 25th second 1mL of MAPI
NCs dispersed in toluene was quickly dropped onto the center of the
substrate and then dried at 100°C for 10 min. The reference perovskite
film was fabricated using pure toluene as anti-solvent.

Method 3 - M3 - The PbI2 precursor solutions were prepared by dissolving
PbI2 in DMF to get 40w% solution. 100 µL of PbI2 solution was spun onto
the substrate at 3000 rpm for 30 s, then dried at 100°C for 30 min. In
the second step, substrates were dipped in a solution containing MAI for
30 min to allow the conversion of PbI2 into CH3NH3PbI3. The dipping
solution consisted of a mixture of MAPI NCs dispersed in toluene and MAI
in anhydrous IPA (10 mgmL^-1) (1:9 vol ratio). The reference perovskite
film was fabricated using a dipping solution with MAI in IPA only.


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Characterisation
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AFM - This contains the data from the atomic force microscopy, using
Nanosurf easyscan 2 FlexAFM. The data are in .nid files, which can be
read by Gwyddion.  The files use the naming convention
[sample]_[magnification].nid.  There are two subfolders:

  - Dilution contains AFM images of samples with different concentration
    of MAPI NCs where IP456 is 100vol%, IP457 is 65vol% and IP458 is
    30vol%.
  - With&withoutNCs contains two files, where IP439 relates to «with
    NCs» and IP442 relates to «without NCs».


ContactAngles - This contains the data from the contact angle
measurement. Data were analysed using FTA-32 software.  The data are in
.jpeg files.  The files use the naming convention [sample].jpg.  There
are three subfolders:

  - Dilution contains contact angle measurements of samples with
    different concentration of MAPI NCs where IP456 is 100vol%, IP457 is
    65vol% and IP458 is 30vol%.
  - With&withoutNCs contains .jpg files, where IP439 relates to «with
    NCs-M1» and IP442 relates to «without NCs-M1»;  IP443 relates to
    «without NCs-M3» and IP444 relates to «with NCs-M3»; IP445 relates
    to «without NCs-M2» and  IP446 relates to «with NCs-M2»
  - OA-toluene contains .jpg files with different ratios of toluene:OA,
    where IP433 is 5:0, IP434 is 4.5:0.5, IP435 is 4:1, IP436 is
    3.5:1.5, IP437 is 3:2 and IP438 is 2.5:2.5.

CV - This contains the data from the cyclic voltammetry. scans were
performed in a dichloromethane (DCM)  solution of 0.1 M Bu4NPF6 at a
scan rate of 20 mVsecond-1. Ag/AgCl was used as reference electrode and
Pt  as counter electrode. It contains files CV-control «without NCs» and
CV_QD «with NCs»

JVcurves - This contains the data from the JV scans, using Keithley
2601A potentiostat, under 1 Sun intensity and AM 1.5. The data are in
.csv files. Column 1: Voltage [V], Column 2: Current [A].  There are
five subfolders:

  - InvHyst contains data of cells with inverted architecture. IP418 is
    «with NCs» and IP465 is «without NCs».  QDNiO is a list of main PV
    parameters of cells «with NCs»
  - Method1 contains files of JV scans of cells deposited with method 1.
    (subfolders with control cells «without NCs» and cells «with NCs»)
  - Method2 contains files of JV scans of cells deposited with method 2.
    (subfolders with control cells «without NCs» and cells «with NCs»)
  - Method3 contains files of JV scans of cells deposited with method 3.
    (subfolders with control cells «without NCs» and cells «with NCs»)
  - Stability contains files of stability JV scans of cells «with NCs»
    and «without NCs».


XRD - This contains the data with XRD patterns, using Bruker Advance D8
X-ray diffractometer with a Cu Ka source.  IP347 «without NCs» and IP348
«with NCs». The data are in .xlsx files. Column 1: 2theta [deg], Column
2: intensity [counts].

UV-Vis - This contains the data with UV-Vis spectra, using Perkin-Elmer
Lambda 750S UV/Vis spectrometer, from 900 nm to 300 nm.  IP468 «without
NCs» and IP469 «with NCs» (R stands for R% spectrum and T stands for T%
spectrum)