Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
A low-cost and simple process tandem structure including a top cell with high bandgap and a bottom cell with lower bandgap would be a promising alternative for high efficiency solar cells. In this work, perovskite solar cells (as a top cell) and p-type c-Si solar cells (as a bottom cell) were fabricated and perovskite/crystalline silicon tandem structure was introduced. For the primary work of the tandem structure, a flat surface crystalline silicon solar cell was processed in this work. Boron doped CZ-Si wafers (100) with thickness of 550 μm and resistivity of 3-10 Wcm were used in this work. First, all wafers werewent through HF dip and UV/O3treatment. Then, SiO2 were coated on rear side of the samples as a diffusion barrier for phosphorus. After that, POCl3 diffusion was carried out at 890°C for 20 min. After the diffusion process PSG and SiO2 layer on rear were removed by diluted HF and substrate was cut into 25 mm2 size pieces. Then, Al was printed onback side of substrates and fired at 800 °C using rapid thermal annealing.Fabrication of perovskite solar cell starts with the coating of blocking TiO2 layer on the cleaned FTO glass by spray pyrolysis. Porous TiO2 layer was fabricated by a spin coating method (4000 rpm for 30 s). After spin coating porous TiO2, annealed at 500 °C. 1.2 M of PbI2 was dissolved in N,N dimethylformamide by stirring at 70 °C, deposited on the mesoporous TiO2 film by spin-coating at 6500 rpm for 20 s and dried at 70 °C for 30 min. Then, the TiO2/PbI2 film was dipped into a solution of CH3NH3I in 2-propanol (10 mg/ml) for 20 s and spun to dry at 4000 rpm for 8 s (2 s acceleration). Finally, the deposited CH3NH3PbI3 film was dried on a hotplate at 70 °C for 30 min. Spiro-OMeTAD was deposited as an organic hole conducting material according to by spin-coating at 4000 rpm. In order to form a tandem structure perovskite solar cell was stacked to the crystalline silicon solar cell with an inter junction layer. J–V curves were measured for the sample with an area of 0.25 cm2. The best fabricated tandem solar cell reaches the efficiency of 13.7% with Jsc of 12.3 mA/cm2, Voc of 1.56 V and FF of71.2%.
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