Study on hole-transport-material-free planar TiO2/CH3NH3PbI3 heterojunction solar cells: the simplest configuration of a working perovskite solar cell

Author(s): Ying Liu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Shulin Ji ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Shuxin Li ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Weiwei He ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Ke Wang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Haibo Hu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Changhui Ye ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Journal of Materials Chemistry A

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Perovskite solar cells have been widely investigated owing to their high efficiency and low production cost.

Abstract

Perovskite solar cells have been widely investigated owing to their high efficiency and low production cost. The working principle of perovskite solar cells is also a hot research topic. Investigations show that either the microporous oxide layer or the hole transport material could be omitted (planar configuration vs. hole-transport-material-free configuration). However, it is not known if the configuration of perovskite solar cells could be further simplified. In this work, we report on a simple hole-transport-material-free planar heterojunction perovskite solar cell with the structure FTO/hole blocking layer (compact TiO ₂ film)/CH ₃NH ₃PbI ₃/Au. We achieved a power conversion efficiency of 10.04% under one sun illumination for this simple configuration of perovskite solar cells using high-quality planar CH ₃NH ₃PbI ₃ films grown by a well reproducible method. Capacitance–voltage measurements show that a built-in field aiding in taking out the photocurrent to the external circuit and suppressing the back reaction of electrons from the TiO ₂ to the CH ₃NH ₃PbI ₃ film was formed in the TiO ₂/CH ₃NH ₃PbI ₃ interface depletion region. Impedance spectroscopy measurements show that a transport resistance R _tr originating from the perovskite active layer was suppressed by a large number of photo-generated currents produced at the CH ₃NH ₃PbI ₃ layer under light illumination.

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Efficient, high yield perovskite photovoltaic devices grown by interdiffusion of solution-processed precursor stacking layers

Zhengguo Xiao, Jing-Cheng Bi, Yuchuan Shao … (2014)

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Low-temperature processed electron collection layers of graphene/TiO2 nanocomposites in thin film perovskite solar cells.

Jacob Wang, James Ball, Eva Barea … (2014)

The highest efficiencies in solution-processable perovskite-based solar cells have been achieved using an electron collection layer that requires sintering at 500 °C. This is unfavorable for low-cost production, applications on plastic substrates, and multijunction device architectures. Here we report a low-cost, solution-based deposition procedure utilizing nanocomposites of graphene and TiO2 nanoparticles as the electron collection layers in meso-superstructured perovskite solar cells. The graphene nanoflakes provide superior charge-collection in the nanocomposites, enabling the entire device to be fabricated at temperatures no higher than 150 °C. These solar cells show remarkable photovoltaic performance with a power conversion efficiency up to 15.6%. This work demonstrates that graphene/metal oxide nanocomposites have the potential to contribute significantly toward the development of low-cost solar cells.