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journal article·2021-01

Titanium Nanopillar Arrays Functioning as Electron Transporting Layers for Efficient, Anti‐Aging Perovskite Solar Cells

Jie Zhao, Peng Sun, Zhongwei Wu, Jun Li, Xiaohan Wang, Ting Xiao, Lin Yang, Zijian Zheng, Zhifeng Huang

Small· Volume 17· Issue 2
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Source abstract

Abstract

Abstract Electron transporting layers (ETLs), required to be optically transparent in perovskite solar cells (PSCs) having regular structures, possess a determinant effect on electron extraction and collection. Metal oxides (e.g., TiO2) have overwhelmingly served as ETLs, but usually have low electron mobility (μe < 10−2 cm2 V−1 s−1) not favorable for photovoltaic conversion. Here, metal oxides are replaced with metals (e.g., Ti with μe ≈ 294 cm2 V−1 s−1) that are sculptured via glancing angle deposition to be a close‐packed nanopillar array (NaPA), which vertically protrudes on a transparent electrode to obtain sufficient optical transmission for light harvesting in perovskite. Ti NaPAs, whose rough surfaces are passivated with 5 nm thick TiO2 (i.e., Ti NaPAs@TiO2) to suppress exciton recombination, lead to the champion power conversion efficiency (PCE) of 18.89% that is superior to that of MAPbI3 PSCs without Ti NaPAs@TiO2 or containing TiO2 NaPAs@TiO2, owing to high surface wettability, high μe, and relatively low work function of Ti. Furthermore, Ti NaPAs@TiO2 effectively prevents the decomposition of MAPbI3 to achieve long‐term shelf stability whereby 50‐day aging only causes 15% PCE degradation. This work paves the way toward widening the material spectrum, from semiconductors to metals, to generate a diverse range of ETLs for producing efficient optoelectronic devices with long‐term shelf stability.
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Research context

NanomaterialsElectronic materialsMaterials processing

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Energy Soochow Institute for Energy and Materials Innovations & Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 China

Jiangsu Province Cultivation base for State Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou Jiangsu 213164 China

Department of Physics Hong Kong Baptist University (HKBU) Kowloon Tong Kowloon Hong Kong SAR China

Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China

Laboratory for Advanced Interface and Materials Research Centre for Smart Wearable Technology Institute of Textiles Clothing The Hong Kong Polytechnic University Hung Hom Hong Kong SAR China

HKBU Institute of Research and Continuing Education Shenzhen Guangdong 518000 China

Institute of Advanced Materials State Key Laboratory of Environmental and Biological Analysis Golden Meditech Centre for NeuroRegeneration Sciences HKBU Kowloon Tong Kowloon Hong Kong SAR China

Funding

Hong Kong Baptist University · Hong Kong Polytechnic University · National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province

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