Role of π-conjugated-length-regulated perovskite intergrain interconnecting in the photovoltaic performance of perovskite solar cells

钙钛矿(结构) 材料科学 共轭体系 磁滞 钝化 化学工程 纳米技术 结晶学 化学 物理 聚合物 复合材料 工程类 图层(电子) 量子力学
作者
Peng Cheng,Xuefeng Xia,Xiaofeng Wang,Jiayi Peng,Zhiping Fan,Fan Li
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:585: 152670-152670 被引量:6
标识
DOI:10.1016/j.apsusc.2022.152670
摘要

• The role of π-conjugated-length-regulated intergrain interconnecting in the photovoltaic performance of CH 3 NH 3 PbI 3 inverted planar perovskite solar cells is demonstrated. • The introduction of bilateral dicarboxyic acid additives with the biphenyl group (BPDA) can effectively control the crystal growth of perovskites, passivate defects/traps and tighten the interconnecting of perovskite grains. • The devices with BPDA achieved high PCE increased to 20.87% along with negligible hysteresis and excellent moisture stability. Despite great advancements in perovskite solar cells (PSCs), the unsatisfactory intergrain interconnecting in polycrystalline perovskite films remains a challenge to be addressed. Herein, three bilateral dicarboxyic acids, i.e. suberic acid (SA), p-phthalic acid (PTA) and biphenyl dicarboxylic acid (BPDA), are employed as additives to uncover the role of π-conjugated-length-regulated intergrain interconnecting in PSCs. Benefiting from strong interactions between two-sided carboxyl groups and perovskites, incorporation of these additives can control crystal growth, passivate defects/traps and tighten the interconnecting of perovskite grains. Moreover, thanks to the large π-electron delocalization and π-π interactions, introduction of π-conjugated additives (i.e. PTA and BPDA) can evidently intensify the preferred orientation of perovskite crystals and improve the carrier transport between perovskite grains. Especially, by extending π-conjugated structure to biphenyl groups (i.e. BPDA), high-quality perovskite films exhibiting large and ordered grains with vertically columnar alignment, along with strong electrical intergrain interconnecting, are obtained. Moreover, the intrinsic hydrophobicity nature of π-conjugated structures is helpful for improving the moisture stability. Eventually, the champion efficiency of 20.87% is acquired with negligible hysteresis and excellent moisture stability for PSCs with BPDA. Our work demonstrates that the π-conjugated length of additives can play a vital role in regulating the intergrain interconnecting.
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