Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In recent years, all-solid-state hybrid solar cells have developed quickly because of its low cost and processability1,2. CH3NH3PbI3has been used as light absorber due to its low band gap, good stability and large optical absorption in air.Currently, solar cells based on perovskites have achieved a high power-conversion efficiency of up to 15%3. However, conductivity of spiro-OMeTAD is low (about 10−5 S cm−1) and its molecular structure is complicated, which may limit its large-scale application4. Thereby, we try to find a low-cost hole transport material with high hole mobility to replace the spiro-OMeTAD.
Here, we report on the fabrication of mp-TiO2/CH3NH3PbI3/P3HT- MWNTs /Au hybrid solar cells，which achieved a PCE of up to 6.67 %. The MWNTs acted as charge transportation path and improve its charge mobility in the composite. It may pave the way for efficient solar cells with low cost.
The relevant mechanism is further studied by the EIS method (shown inFigure 3). Charge transfer resistanceof mp-TiO2/CH3NH3PbI3/P3HT/Au device is smaller than that of mp-TiO2/CH3NH3PbI3/P3HT-MWNTs/Au, indicating recombination at the interface between P3HT-MWNTs and TiO2 is lower than that of the interface between P3HT and TiO2. In summary, the addition of MWNTs preferably facilitates the electron diffusion to the collecting electrode (FTO) and mitigates the charge recombination between electrons in the TiO2 film and holes in the P3HT matrix, leading to an improved photovoltage.
Figure1.Transmission electron microscopy (TEM) picture of MWNTs/P3HT composite
[1]Chang J A, Rhee J H, Im S H, et al, High-Performance Nanostructured Inorganic-Organic Heterojunction Solar Cells. Nano Lett, 2010, 10(7), 2609-2612. [2]Chang J A, Im S H, Lee Y H, et al, Panchromatic Photon-Harvesting by Hole-Conducting Materials in Inorganic-Organic Heterojunction Sensitized-Solar Cell through the Formation of Nanostructured Electron Channels. Nano Lett, 2012, 12(4), 1863-1867. [3]Burschka J, Pellet N, Moon S J, et al, Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature, 2013, 499(7458), 316. [4]Lee M M, Teuscher J, Miyasaka T, et al, Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science, 2012, 338(6107), 643-647.
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