Dopant-free hole transporting materials with supramolecular interactions and reverse diffusion for efficient and modular p-i-n perovskite solar cells

• 作者: Deying Luo Moyao Zhang Rongming Xue Rui Zhu Weijie Chen Yang (Michael) Yang Yaowen Li Yongfang Li
• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2020,（7）
• 页码范围: 987-996
• 页数: 10页
• 语种: 英文

摘要

The rational design of dopant-free organic hole-transporting layer (HTL) materials is still a challenge for realizing high-efficient and stable p-i-n planar perovskite solar cells (pero-SCs).Here,we synthesized two π-conjugated small-molecule HTL materials through tailoring the backbone and conjugated side chain to carefully control molecular conformation.The resultant BDT-TPA sTh containing a planar fused benzo[1,2-b:4,5-b']dithiophene (BDT) core and a conjugated thiophene side chain showed the planar conformation.X-ray crystallography showed a favorable stacking model in solid states under the parallel-displaced π-π and additional S-π weak-bond supramolecular interactions,thus achieving an obviously increased hole mobility without dopants.As an HTL material in p-i-n planar pero-SCs,the marginal solubility of BDT-TPA-sTh enabled inverse diffusion into the perovskite precursor solution for assisting the subsequent perovskite film growth and passivating the uncoordinated Pb2+ ion defects.As a result,the planarp-i-n pero-SCs exhibited a champion power conversion efficiency (PCE) of 20.5％ and enhanced moisture stability.Importantly,the BDT-TPA-sTh HTL material also showed weak thickness-photovoltaic dependence,and the pero-SCs with blade-coated BDT-TPA-sTh as a HTL achieved a 15.30％ PCE for the 1-cm2 modularized device.This HTL material design strategy is expected to pave the way toward high-performance,dopant-free and printing large-area planar p-i-n pero-SCs.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Rongming Xue		1	0	0.0	0.0
2	Moyao Zhang		1	0	0.0	0.0
3	Deying Luo		1	0	0.0	0.0
4	Weijie Chen		1	0	0.0	0.0
5	Rui Zhu		1	0	0.0	0.0
6	Yang (Michael) Yang		1	0	0.0	0.0
7	Yaowen Li		1	0	0.0	0.0
8	Yongfang Li		1	0	0.0	0.0