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<p>The bottom-up construction of electronics from colloidal quantum dots (CQDs) could innovate nanotechnology manufacturing through printing. However, the unstable and expensive semiconductive CQD inks make the scaling up of CQD electronics challenging. Here we develop a strategy for engineering the solution chemistry of lead sulfide (PbS) CQD inks prepared from a low-cost direct synthesis method. By creating an iodine-rich environment in weakly coordinating solvents, we convert the iodoplumbates into functional anions, which condense into a robust surface shell. The fully charged electrostatic surface layer prevents aggregation and epitaxial fusion of CQDs, yielding stable inks. By eliminating the fusion-induced inter-band states, we print a compact CQD film with uniformity in three dimensions, flattened energy landscape and improved carrier transport. We achieved a certified efficiency of 13.40% on 0.04 cm<sup>2</sup> cells, with a 300-fold increase in active area, scaling up to a 12.60 cm<sup>2</sup> module with a certified efficiency of 10%.</p>

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Overcoming efficiency and cost barriers for large-area quantum dot photovoltaics through stable ink engineering

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Guozheng Shi,
  • Xiaobo Ding,
  • Zeke Liu,
  • Yang Liu,
  • Yifan Chen,
  • Cheng Liu,
  • Zitao Ni,
  • Haibin Wang,
  • Katsuji Ito,
  • Keisuke Igarashi,
  • Kun Feng,
  • Kaicheng Zhang,
  • Larry Lüer,
  • Wei Chen,
  • Xingyi Lyu,
  • Bin Song,
  • Xiang Sun,
  • Lin Yuan,
  • Dong Liu,
  • Yusheng Li,
  • Kunyuan Lu,
  • Wei Deng,
  • Youyong Li,
  • Peter Müller-Buschbaum,
  • Tao Li,
  • Jun Zhong,
  • Satoshi Uchida,
  • Takaya Kubo,
  • Ning Li,
  • Joseph M. Luther,
  • Hiroshi Segawa,
  • Qing Shen,
  • Christoph J. Brabec,
  • Wanli Ma

摘要

The bottom-up construction of electronics from colloidal quantum dots (CQDs) could innovate nanotechnology manufacturing through printing. However, the unstable and expensive semiconductive CQD inks make the scaling up of CQD electronics challenging. Here we develop a strategy for engineering the solution chemistry of lead sulfide (PbS) CQD inks prepared from a low-cost direct synthesis method. By creating an iodine-rich environment in weakly coordinating solvents, we convert the iodoplumbates into functional anions, which condense into a robust surface shell. The fully charged electrostatic surface layer prevents aggregation and epitaxial fusion of CQDs, yielding stable inks. By eliminating the fusion-induced inter-band states, we print a compact CQD film with uniformity in three dimensions, flattened energy landscape and improved carrier transport. We achieved a certified efficiency of 13.40% on 0.04 cm2 cells, with a 300-fold increase in active area, scaling up to a 12.60 cm2 module with a certified efficiency of 10%.