Non-wetting surface-driven high-aspect-ratio crystalline grain growth for efficient hybrid perovskite solar cells

By Cheng Bi, Qi Wang, Yuchuan Shao, Yong-bo Yuan, Zhengguo Xiao, Jinsong Huang. Nature Communications, 2015

1,430 citations recorded by the source corpus.

Large-aspect-ratio grains are needed in polycrystalline thin-film solar cells for reduced charge recombination at grain boundaries; however, the grain size in organolead trihalide perovskite (OTP) films is generally limited by the film thickness. Here we report the growth of OTP grains with high average aspect ratio of 2.3–7.9 on a wide range of non-wetting hole transport layers (HTLs), which increase nucleus spacing by suppressing heterogeneous nucleation and facilitate grain boundary migration in grain growth by imposing less drag force. The reduced grain boundary area and improved crystallinity dramatically reduce the charge recombination in OTP thin films to the level in OTP single crystals. Combining the high work function of several HTLs, a high stabilized device efficiency of 18.3% in low-temperature-processed planar-heterojunction OTP devices under 1 sun illumination is achieved. This simple method in enhancing OTP morphology paves the way for its application in other optoelectronic devices for enhanced performance. The performance of hybrid perovskite solar cells is diminished by charge recombination, which commonly occurs at grain boundaries. Here, the authors employ a non-wetting hole transport layer which promotes the growth of highly crystalline films with fewer grain boundaries, leading to improved device efficiencies.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a698c708eaddcaad321e3d861e303244cd875aad

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Citations in the corpus

Flexible, transparent nanocellulose paper-based perovskite solar cells (2019, methodology): “The flexible PSCs were prepared on the NCP-based substrate based on the device structure of doped PEDOT:PSS anode (40 nm)/PEDOT:PSS 4083 (30 nm)/perovskite (350 nm)/PCBM (100 nm)/Al (100 nm).(45,46) As hole transport layer, the PEDOT:PSS 4083 was spin-coated on the doped PEDOT:PSS anode at 5000 rpm ”