研究目的
To investigate the effect of a nanoscale TiO2 nanocubic particle as an interfacial modifier between compact TiO2 layer and CH3NH3PbI3 layer on the photovoltaic performances of planar heterojunction perovskite solar cells.
研究成果
The study concludes that employing a TiO2 nanocubic as an interfacial modifier between compact TiO2 (c-TiO2) and perovskite layer effectively passivates defects existed in wo TiO2/MAPbI3. The modified w-1 TiO2 binds tightly with perovskite film and provides a better platform for the growth of high-quality perovskite absorber, leading to a significant increase in PCE from 10.24% to 13.40%.
研究不足
The study acknowledges that the thicker w-1.5 TiO2 film decreases the light transmittance and the cracks existed in the surface will lead to current leakage, which could potentially limit the photovoltaic performance of devices.
1：Experimental Design and Method Selection
The study employed a simple spin-coating and chemical bath deposition (CBD) method for synthesizing the compact TiO2 (c-TiO2) layer and interfacial modification layer, respectively. The c-TiO2 was deposited on clean SnO2:F (FTO) substrates by spin-coating an acidic solution of butyl titanate in ethanol.
2：Sample Selection and Data Sources
The samples were prepared by immersing the FTO/c-TiO2 substrates into an aqueous solution containing 25 mM TiCl4 and (NH4)2TiF6 with different concentrations (0 mM, 0.5 mM, 1 mM and 1.5 mM) at 70 °C for 30 min.
3：List of Experimental Equipment and Materials
FEI MAGELLAN 400 Scanning Electron Microscope (SEM), JEOL JEM-2200FS High-resolution transmission electron microscopy (HR-TEM), UV-3150 double-beam spectrophotometer, Rigaku D/max-2500 X-ray diffractometer (XRD), HR Evolution micro-Raman spectrometer, Solartron 1260 impedance analyser, QTest Station 1000A, Keithley 2400 source measure unit.
4：Experimental Procedures and Operational Workflow
The CH3NH3PbI3 films were fabricated by a one-step solution deposition method in the air within the humidity of 15-25 %. The completely dissolved solution was spin-coated on the TiO2 films at 500 rpm for 5 sec and 4000 rpm for 20 sec followed. 500 μL of diethyl ether was dropped onto the rotating substrate during the high speed at 10 sec before the end of this procedure.
5：Data Analysis Methods
The data were analyzed using various techniques including SEM, HR-TEM, UV-vis absorption spectra, XRD, steady-state PL, TRPL, EIS, and J-V curves measurements.
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FEI MAGELLAN 400 Scanning Electron Microscope
MAGELLAN 400
FEI
Observing the morphology and microstructure of films.
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JEOL JEM-2200FS High-resolution transmission electron microscopy
JEM-2200FS
JEOL
Performing HR-TEM at an acceleration voltage of 200 KV.
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Rigaku D/max-2500 X-ray diffractometer
D/max-2500
Rigaku
Checking the composition and crystal structure of products.
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Keithley 2400 source measure unit
2400
Keithley
Measuring the J-V curves of devices.
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UV-3150 double-beam spectrophotometer
UV-3150
Recording UV-vis absorption spectra at room temperature.
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HR Evolution micro-Raman spectrometer
HR Evolution
Obtaining steady-state PL spectra with an excitation source of 473 nm laser.
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Solartron 1260 impedance analyser
1260
Solartron
Conducting EIS measurements with the frequency range between 107 Hz and 10-1 Hz.
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QTest Station 1000A
1000A
CROWNTECH, INC.
Recording the external quantum efficiency (EQE) curves.
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