Bulk Heterojunction-Assisted Grain Growth for Controllable and Highly Crystalline Perovskite Films

ACS Applied Materials & Interfaces
Yanliang LiuKwang Ho Kim

Abstract

Perovskite optoelectronic devices are being regarded as future candidates for next-generation optoelectronic devices. Device performance has been shown to be influenced by the perovskite film, which is determined by the grain size, surface roughness, and film coverage; therefore, developing controllable and highly crystalline perovskite films is pivotal for highly efficient devices. In this work, an innovative bulk heterojunction (BHJ)-assisted grain growth (BAGG) technique was developed to accurately control the quality of perovskite films. By a simple modulation of the polymer-to-PC61BM ratio in the BHJ film, the transition to a complete film phase from the perovskite precursor was accurately regulated, resulting in a controllable perovskite grain growth and high-quality final perovskite film. Moreover, because the BHJ layer could seep deeply into the perovskite active layer through the grain boundaries in the BAGG process, it facilitated the interface engineering and charge transport. The perovskite solar cells containing an optimized CH3NH3PbI3 film presented a high efficiency of 18.38% and fill factor of 83.71%. The perovskite light-emitting diode that contained a nanoscale and uniform CH3NH3PbBr3 film with full coverage p...Continue Reading

References

Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Apr 24, 2014·Advanced Materials·Christian WehrenfennigLaura M Herz
Sep 1, 2014·Nature Nanotechnology·Jeong-Hyeok ImNam-Gyu Park
Oct 1, 2014·Nature Communications·Michele SabaGiovanni Bongiovanni
Nov 18, 2015·Advanced Materials·Yichuan LingHanwei Gao
Jun 3, 2016·ACS Applied Materials & Interfaces·Qiliang WuShangfeng Yang
Aug 5, 2016·ACS Applied Materials & Interfaces·Jiabin HuangDeren Yang
Mar 28, 2017·ACS Applied Materials & Interfaces·Yanliang LiuKwang Ho Kim
Oct 19, 2017·Advanced Materials·Qi JiangJingbi You
Oct 28, 2017·ACS Applied Materials & Interfaces·Kai-Ming ChiangHao-Wu Lin

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