Publication date: 17th February 2025
Perovskite solar cells (PSCs) typically feature a simple planar structure, where the perovskite photo-absorber layer is sandwiched between two electrical contacts and their respective charge-selective layers [1]. This configuration enables efficient extraction of photo-generated charge carriers from the perovskite layer, leading to remarkably high power conversion efficiencies (PCEs) exceeding 26% in state-of-the-art PSCs [2]. However, further improvements in PCE are partially constrained by inherent light transmission losses. These losses stem from reflection at material interfaces and parasitic light absorption by the substrate, the transparent conducting electrode, and the charge-selective layers [3].
In my presentation, I will address this challenge by exploring an alternative device architecture known as the back-contact (BC) structure [4]. In BC PSCs, all electrode components are positioned on one side of the perovskite active layer, allowing the perovskite photo-absorber layer to be directly illuminated. This design effectively eliminates transmission losses associated with traditional planar structures. Moreover, the BC structure offers enhanced access to the perovskite photo-absorber layer, enabling further electro-optic optimizations such as surface trap state passivation and the application of anti-reflective coatings [5,6].
From a device physics perspective, the unique geometry of BC PSCs decouples the properties of the photo-absorber from those of the electrodes. This distinction is invaluable for investigating the degradation mechanisms of the perovskite photo-absorber layer under environmental stressors. These studies can be conducted through in situ measurements during exposure or through post-exposure analyses, providing critical insights into the stability and performance of BC PSCs.
The author thank the scientific research grants from the Committee of Science of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant Numbers: AP23483937 and АР08052412) and Nazarbayev University (Grant Numbers: 110119FD4512 and 021220CRP1922) for supporting this work.
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