Publication date: 1st April 2013
Enhancing the power conversion efficiency in organic-inorganic heterojunction solar cells have been facing serious huddle. The standard nanoparticle TiO2 based heterojunction solar cells are moderately efficient [1] but the nanostructure is composed of disordered, low surface area and poor pore structure TiO2, thus necessitate the finding of new TiO2 morphology for effective photon harvesting. So far very reports are there with the different TiO2 morphology for heterojunction solar cells [2, 3]. Hollow nanostrucutured electrodes are widely used in energy related devices because of their large surface area, bigger pores and light scattering properties [4, 5]. Here, we report the first successful application of Hollow cubic TiO2 (HCT) nanostructured electrode sensitized with stibnite for all solid-state heterojunction solar cells. Figure 1 showing the SEM morphological images of the doctor bladed HCT electrode on FTO substrate. We investigated the influence of stibnite sensitized time (90, 150, 210, and 270 min respectively) on the HCT surface and its effects on light harvesting and power conversion efficiency. Device performance increases with stibnite deposition time due to the increased light harvesting associated with the thicker stibnite layers. But when the stibnite deposition time increased after 270min, all the HCT pores and interconnections among each particle are decreased, and thus the desired nanostructure are lost and resulted in low conversion efficiency. Among different stibnite sensitized HCT, device made with the 210min showed highest solar to power conversion efficiency.
FE-SEM surface and cross-sectional images of the doctor bladed HCT on FTO
1. Chang, J. A.; Rhee, J. H.; Im, S. H.; Lee, Y. H.; Kim, H. J.; Seok, S. Il.; Nazeeruddin, M. K.; Gratzel, M. Nano Letters 2010, 10, 2609-2612. 2. Gui, E. L.; Kang, A. M.; Pramana, S. S.; Yantara, N.; Mathews, N.; Mhaisalkar, S. Journal of Electrochemical Society 2012,159, B247-B250. 3. Cardoso, J. C.; Grimes, C. A.; Feng, X.; Zhang, X.; Komarneni, S.; Zanoni, M. V. B.; Bao, N. Chemical Communication2012, 48, 2818-2820. 4. Qian, J.; Liu, P.; Xiao, Y.; Jiang, Y.; Cao, Y.; Ai, X.; Yang, H. Advanced Materials2009, 21, 3663-3667. 5. Crossland, E. J. W.; Kamperman, M.; Nedelcu, M.; Ducati, C.; Wiesner, U.; Smilgies, D. M.; Toombes, G. E. S.; Hillmyer, M. A.; Ludwigs, S.; Steiner, U.; Snaith, H. J. Nano Letters2009, 8, 2807-2812.
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