Perovskite solar cell based on multi-layer gradient energy band electron transport layer and preparation method thereof
An electron transport layer, solar cell technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of heavy silicon solar cells, difficult to prepare flexible and portable photovoltaic devices, etc., to improve low-light performance and photoelectric conversion. The effect of efficiency
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Embodiment 1
[0035] Such as figure 1 As shown, the perovskite solar cell prepared in this implementation has a structure from bottom to top that is substrate 1, FTO transparent conductive layer 2, lead-doped tin oxide three-layer gradient energy level electron transport layer 3-5 (from bottom to top) The top is composed of 3% lead-doped tin oxide, 2% lead-doped tin oxide and 1% lead-doped tin oxide), a perovskite light absorbing layer 6 , a hole transport layer 7 , and a back electrode 8 .
[0036] The preparation of the perovskite solar cell comprises the following steps:
[0037] (1) Ultrasonic cleaning of FTO glass was carried out for 30 minutes with deionized water, absolute ethanol and isopropanol respectively, and then dried with high-purity nitrogen;
[0038] (2) UV ozone treatment is carried out to the cleaned FTO glass sheet to improve the wettability of the FTO surface and increase the work function of the transparent conductive film;
[0039] (3) Spin-coat a layer of tin oxide...
Embodiment 2
[0082] Same as Example 1, the difference is:
[0083] The preparation method of the lead-doped tin oxide multilayer graded energy level electron transport layer was changed to the scraper coating method, the scraper coating speed was 120mm / min, the substrate heating temperature was 50°C, the gap between the scraper and the substrate surface was 50μm, and then at 150 The heat treatment was carried out at ℃ for 30 minutes.
[0084] The obtained perovskite solar cells with lead-doped tin oxide multilayer gradient energy level electron transport layer have a photoelectric conversion efficiency of 17.5%.
Embodiment 3
[0086] Same as Example 1, the difference is:
[0087] The preparation method of the lead-doped tin oxide multilayer gradient energy level electron transport layer was changed to the spraying method, the spraying time was 3s, the substrate heating temperature was 80°C, the distance between the nozzle and the substrate surface was 10cm, and then 30 minute heat treatment.
[0088] The obtained perovskite solar cells with lead-doped tin oxide multilayer gradient energy level electron transport layer have a photoelectric conversion efficiency of 17.2%.
[0089] figure 2 Schematic diagram of the forbidden band width calculated from the absorption edge for lead-doped tin oxide with different lead concentrations. It can be seen that lead doping can effectively reduce the band gap of tin oxide.
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