Electrodeposited TiO2 blocking layers for perovskite solar cells by pulsed current

Tsung-Yu Hsieh^a, Cheng-You Hong^a, Tzi-Chien Wei^a, Tzu-Sen Su^a

^aNational Tsing Hua University, Department of Chemical Engineer R418 No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C., Hsinchu, Taiwan, 30013, Taiwan, Republic of 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, Tzu-Sen Su, 329
Publication date: 5th February 2015

An uniform and pinhole-free blocking layer plays an important role in high-performance perovskite solar cells(PSCs). The blocking layer with pinhole-free morphology is acquired to prevent either perovskite or hole transport layer (HTL) from contacting fluorine doped tin oxide (FTO) substrate directly, which would be paths of electron recombination and then reduce the performance of the device. Pulse-current electrodeposition (PCED) method is a commonly used technique as it associates with many advantages such as reduction in porosity and low level of inclusions compared to conventional direct current electrodeposition (DCED) process. In this study, we utilized DCED and PCED processes to create compact TiO₂ onto FTO as blocking layer for PSC. By adjusting the current density, coulomb density and duty cycle in PCED, a series of dense TiO₂ layer with variant thicknesses and morphologies were prepared via chronopotentiometry method. Scanning electron microscope (SEM) images illustrated high coverage of as prepared TiO₂ layer with controllable thickness.Cyclic voltammetry (CV) in three-electrode system confirm that dense and thin TiO₂ layer can effectively suppress recombination reaction of ferro/ferricyanide redox couple. Comparing to spin coating (SC) and DCED method, well-covered FTO surface by PCED-TiO₂ provides better function as suppressing recombination and hence improves the V_OC on cell performance. The full device with PCED-TiO₂ blocking layer shows high power conversion efficiency (PCE) of 12.34%.
Figure1. Photocurrent-voltage (J-V) curves at 1 sun illumination (solid line) and dark (dash line) of perovskite solar cells based on different TiO2 compact layers.The insert illustration is the device configuration.

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