Perovskite phase heterojunction solar cells

Ran Ji, Zongbao Zhang, Yvonne J. Hofstetter, Robin Buschbeck, Christian Hänisch, Fabian Paulus and Yana Vaynzof ()
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Ran Ji: Technische Universität Dresden
Zongbao Zhang: Technische Universität Dresden
Yvonne J. Hofstetter: Technische Universität Dresden
Robin Buschbeck: Technische Universität Dresden
Christian Hänisch: Technische Universität Dresden
Fabian Paulus: Technische Universität Dresden
Yana Vaynzof: Technische Universität Dresden

Nature Energy, 2022, vol. 7, issue 12, 1170-1179

Abstract: Abstract Modern photovoltaic devices are often based on a heterojunction structure where two components with different optoelectronic properties are interfaced. The properties of each side of the junction can be tuned by either utilizing different materials (for example, donor/acceptor) or doping (for example, p–n junction) or even varying their dimensionality (for example, 3D/2D). Here we demonstrate the concept of phase heterojunction (PHJ) solar cells by utilizing two polymorphs of the same material. We demonstrate the approach by forming γ-CsPbI3/β-CsPbI3 perovskite PHJ solar cells. We find that all of the photovoltaic parameters of the PHJ device significantly surpass those of each of the single-phase devices, resulting in a maximum power conversion efficiency of 20.1%. These improvements originate from the efficient passivation of the β-CsPbI3 by the larger bandgap γ-CsPbI3, the increase in the built-in potential of the PHJ devices enabled by the energetic alignment between the two phases and the enhanced absorption of light by the PHJ structure. The approach demonstrated here offers new possibilities for the development of photovoltaic devices based on polymorphic materials.

Date: 2022
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DOI: 10.1038/s41560-022-01154-y

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