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Perovskite-polymer hybrid solar cells with near-infrared external quantum efficiency over 40%

Abstract

In the past several years, conjugated polymers and organometal halide perovskites have become regarded as promising light-absorbing materials for next-generation photovoltaic devices and have attracted a great deal of interest. As the main part of this contribution, we describe the enhancement of near-infrared (NIR) photoresponse of well-known CH3NH3PbI3−x Cl x -based solar cells by the integration of bulk heterojunction (BHJ) small band gap polymer:fullerene absorbers. Particularly, the integration of a commercially available polymer PDPP3T and PCBM-based BHJ boosts the peak external quantum efficiency (EQE) by up to 46% in the NIR region (800−1000 nm), which is outside of the photoresponsive region (300−800 nm) of conventional perovskite solar cells. This substantial improvement in the EQE over the NIR region offers an additional current density of ∼5 mA cm−2 for the control perovskite solar cell, and a high power conversion efficiency (PCE) of over 12% was obtained in the perovskite/BHJ-based solar cells. In addition, the insertion of the BHJ absorber consisting of a small band gap polymer PDTP-DFBT and PCBM also results in nearly 40% EQE for the perovskite/BHJ solar cell. The results also reveal that controlling over the polymer/PCBM weight ratio for a BHJ absorber is the key to achieving the optimal efficiency for this type of perovskite-polymer hybrid solar cell.

中文摘要

近年来, 共轭聚合物和钙钛矿型有机金属卤化物被视为极具潜力的光伏材料, 引起了广泛的研究兴趣. 本文通过引入两种本体异质结(BHJ)聚合物: 富勒烯活性层, 大幅提高了基于CH3NH3PbI3−x 的钙钛矿太阳能电池的近红外光响应特性. 其中, 基于窄带隙聚合物PDPP3T的钙钛矿/BHJ杂化太阳能电池在近红外区域(800∼1000 nm)内的外量子效率(EQE)峰值高达46%, 且该区域已经超出了CH3NH3PbI3−x 型太阳能电池的光响应范围(300∼800 nm). 相较于参照的钙钛矿太阳能电池, 近红外区域大幅提升的EQE为钙钛矿/BHJ杂化太阳能电池贡献了额外的电流密度(∼5 mA cm−2), 因此其光电转换效率达到了12%以上. 此外, 引入基于聚合物PDTP-DFBT的BHJ也可以使钙钛矿太阳能电池在近红外区域的EQE达到40%以上. 研究结果也表明优化BHJ的聚合物: 富勒烯比例是提高这类钙钛矿-聚合物杂化太阳能电池性能的关键.

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Correspondence to Jianhui Hou.

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Long Ye was born in 1988. He received his PhD degree in polymer physics and chemistry from ICCAS in 2015 under the supervision of Prof. Jianhui Hou. Currently, he is a postdoctoral research associate working with Prof. Harald Ade at North Carolina State University. His current research interests are developing high-efficiency organic solar cells and revealing the critical factors related to the morphology/performance of organic and hybrid solar cells.

Jianhui Hou received his PhD degree in physical chemistry from ICCAS in 2006 (adviser: Prof. Yongfang Li). Then he worked as a postdoctoral researcher at Prof. Yang Yang’s group at the University of California, Los Angeles (UCLA) from 2006−2008 and then director of the Research of Solarmer Energy Inc. from 2008−2010. After that, he became a full professor at ICCAS since 2010 and an adjunct professor at the University of Science and Technology Beijing since 2012. His present research focuses on design, synthesis, and application of organic/polymer photovoltaic materials.

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Ye, L., Fan, B., Zhang, S. et al. Perovskite-polymer hybrid solar cells with near-infrared external quantum efficiency over 40%. Sci. China Mater. 58, 953–960 (2015). https://doi.org/10.1007/s40843-015-0102-x

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Keywords

  • Solar Cell
  • Perovskite
  • External Quantum Efficiency
  • Polymer Solar Cell
  • Hybrid Solar Cell