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DOE OSTI · 1971493

Tailoring Molecular-Scale Contact at Perovskite/Polymeric Hole Transporting Material Interface for Efficient Solar Cells

Sun, Jiaonan·Ma, Ke·Lin, Zih‐Yu·Tang, Yuanhao·Varadharajan, Dharini·Chen, Alexander X.·Atapattu, Harindi R.·Lee, Yoon Ho·Chen, Ke·Boudouris, Bryan W.·Graham, Kenneth R.·Lipomi, Darren J.·Mei, Jianguo·Savoie, Brett M.·Dou, Letian
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Abstract

Perovskite solar cells (PSCs) have delivered more than 25% of power conversion efficiency (PCE) and incorporating polymers as hole transporting layers (HTLs) can further enhance the stability of devices towards the goal of commercialization. Among various polymeric hole transporting materials, poly(triaryl amine) (PTAA) is one of the promising HTL candidates with good stability; however, the hydrophobicity of PTAA causes problematic interfacial contact with perovskite, limiting the device performance. Using molecular side-chain engineering, we successfully constructed a uniform two-dimensional (2D) perovskite interlayer with conjugated ligands, between three-dimensional (3D) perovskites and PTAA. Further, employing conjugated ligands as cohesive elements, perovskite/PTAA interfacial adhesion was significantly improved. As a result, the thin and lateral extended 2D/3D heterostructure enabled the as-fabricated PTAA-based PSCs to achieve a PCE of 23.7%, improved from the 18% of reference devices. Owing to the increased ion migration energy barrier and conformal 2D coating, unencapsulated devices with the new ligands exhibited both superior thermal stability under 60°C heating and moisture stability in ambient conditions.

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14 SOLAR ENERGY2D/3D heterostructure36 MATERIALS SCIENCEPTAAinterface engineeringperovskite solar cells

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Sun, Jiaonan, Ma, Ke, Lin, Zih‐Yu, Tang, Yuanhao, Varadharajan, Dharini, Chen, Alexander X., Atapattu, Harindi R., Lee, Yoon Ho, Chen, Ke, Boudouris, Bryan W., Graham, Kenneth R., Lipomi, Darren J., Mei, Jianguo, Savoie, Brett M., Dou, Letian. 2023-03-21. Tailoring Molecular-Scale Contact at Perovskite/Polymeric Hole Transporting Material Interface for Efficient Solar Cells. https://doi.org/10.1002/adma.202300647

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