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<p>All-perovskite tandem solar cells (TSCs) offer exceptional performance and versatile applicability. However, a significant challenge persists in bridging the power conversion efficiency (PCE) gap between small- and large-area (&gt;1 cm<sup>2</sup>) devices, which presents a formidable barrier to the commercialization of all-perovskite TSCs. Here we introduce a specialized crystal-modifying agent, piracetam, tailored for wide-bandgap perovskites, homogenizing top wide-bandgap subcells and enabling the construction of efficient large-area TSCs. Piracetam, featuring amide and pyrrolidone moieties, initially modulates perovskite nucleation, resulting in large-sized grains, preferred (110) orientation, enhanced crystallinity and uniform optoelectronic properties. During the subsequent annealing process, it further eliminates residual PbI<sub>2</sub> and facilitates the formation of one-dimensional (Pi)PbI<sub>3</sub> (Pi = piracetam) perovskite nanoneedles at the grain boundaries and surfaces. Consequently, single-junction 1.77 eV-bandgap solar cells achieve a certified open-circuit voltage of 1.36 V and a PCE of 20.35%. Furthermore, our monolithic two-terminal all-perovskite TSCs, with aperture areas of 0.07 cm<sup>2</sup> and 1.02 cm<sup>2</sup>, yield PCEs of 28.71% (stabilized 28.55%, certified 28.13%) and 28.20% (stabilized 28.05%, certified 27.30%), respectively, demonstrating a minimal PCE loss of 0.51% when transitioning from small-area to large-area devices. In addition, piracetam demonstrates broad applicability across different perovskite compositions, increasing the PCE from 23.56% to 25.71% for single-junction 1.56 eV-bandgap counterparts. This method thus provides an effective pathway for scalable and efficient all-perovskite TSCs.</p>

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Piracetam shapes wide-bandgap perovskite crystals for scalable perovskite tandems

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Shiqiang Fu,
  • Shun Zhou,
  • Weiwei Meng,
  • Guang Li,
  • Kailian Dong,
  • Dexin Pu,
  • Jin Zhou,
  • Chen Wang,
  • Hongling Guan,
  • Wenlong Shao,
  • Lishuai Huang,
  • Zhenhuang Su,
  • Cheng Wang,
  • Guoyi Chen,
  • Peng Jia,
  • Jiahao Wang,
  • Zuxiong Xu,
  • Xingyu Gao,
  • Hengjiang Cong,
  • Ti Wang,
  • Chuanxiao Xiao,
  • Guojia Fang,
  • Weijun Ke

摘要

All-perovskite tandem solar cells (TSCs) offer exceptional performance and versatile applicability. However, a significant challenge persists in bridging the power conversion efficiency (PCE) gap between small- and large-area (>1 cm2) devices, which presents a formidable barrier to the commercialization of all-perovskite TSCs. Here we introduce a specialized crystal-modifying agent, piracetam, tailored for wide-bandgap perovskites, homogenizing top wide-bandgap subcells and enabling the construction of efficient large-area TSCs. Piracetam, featuring amide and pyrrolidone moieties, initially modulates perovskite nucleation, resulting in large-sized grains, preferred (110) orientation, enhanced crystallinity and uniform optoelectronic properties. During the subsequent annealing process, it further eliminates residual PbI2 and facilitates the formation of one-dimensional (Pi)PbI3 (Pi = piracetam) perovskite nanoneedles at the grain boundaries and surfaces. Consequently, single-junction 1.77 eV-bandgap solar cells achieve a certified open-circuit voltage of 1.36 V and a PCE of 20.35%. Furthermore, our monolithic two-terminal all-perovskite TSCs, with aperture areas of 0.07 cm2 and 1.02 cm2, yield PCEs of 28.71% (stabilized 28.55%, certified 28.13%) and 28.20% (stabilized 28.05%, certified 27.30%), respectively, demonstrating a minimal PCE loss of 0.51% when transitioning from small-area to large-area devices. In addition, piracetam demonstrates broad applicability across different perovskite compositions, increasing the PCE from 23.56% to 25.71% for single-junction 1.56 eV-bandgap counterparts. This method thus provides an effective pathway for scalable and efficient all-perovskite TSCs.