Uniform nanostructures for highly efficient and reproducible perovskite solar cells

Ashraful Islam^a, Wei Chen^a, Jian Liu^a, Yongzhen Wu^a, Liyuan Han^a^,^b, Xudong Yang^b

^aNational Institute of Materials Science, 1-2-1 Sengen, Tsukuba, 305, Japan

^bState Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, 800 Dongchuan RD. Minhang District, Shanghai,, China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Liyuan Han, 073
Publication date: 5th February 2015

Organo-lead trihalide perovskites(CH₃NH₃PbX₃, X = I, Br orCl)as light absorption materialshave attracted great attention recently in photovoltaic research. By virtue oftheir high absorptivity and long carrierdiffusion length, the power conversion efficiency(PCE) was rapidly increased from 3.8% to above 17% within the short five years. In this presentation, I will report some our latest researches in this field. Firstly, the hole-blocking layer is required to prevent holes formed in the perovskie or HTL layer from reaching the FTO electrode, which would otherwise short-circuit the cell. Optimization of the blocking layer is a key factor for improving the device performance of perovskite solar cells. We systematically examined the different blocking layer fabricated by three different methods. The surface morphology and film resistance shows that atomic layer deposition (ALD) based TiO2 compact layer contains much lower density of nano-scaled pinholes with respect to spin-coating and spray pyrolysis ones. The ALD-TiO2 layer acts as an efficient hole-blocking layer in perovskite solar cells, which offers a large shunt resistance and enables a high power conversion efficiency of 12.56%. Secondly, uniform, highly crystalline perovskite film is important for sequential deposition processed perovskite solar cells. We develop a new method to enable an efficient deposition of perovskite film with enhanced conversion rate and surface morphology. By this approach, the energy conversion efficiency of mesoporous-free perovskite solar cells was twice as high as that of using traditional method.
Figure 1. (a) Current density-voltage curves of perovskite solar cells using different blocking layers and (b) the dependence of Voc and efficiency on shunt resistance determined by modelling the device with the given equivalent circuit.
1.Wu Y.; Yang X.; Chen H.; Zhang K.; Qin C.; Liu J.; Peng W.; Islam A.; Bi E.; Ye F.; Yin M.; Zhang P.; Han L. Highly compact TiO2 layer for efficient hole-blocking in perovskite solar cells. Appl. Phys. Express, 2014, 7, 52301. 2.Wu, Y.; Islam, A.; Yang, X.; Qin, C.; Liu, J.; Zhang, K.; Peng, W.; Han, L. Retarding the crystallization of PbI2 for highly reproducible planar-structured perovskite solar cells via sequential deposition. Energy Environ. Sci., 2014,7, 2934-2938 3.Liu, J.; Wu, Y.; Qin, C.; Yang, X.; Yasuda, T.; Islam, A.; Zhang, K.; Peng, W.; Chen, W.; Han, L. A dopant-free hole-transporting material for efficient and stable perovskite solar cells. Energy Environ. Sci., 2014,7, 2963-2967.

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