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Conjugated Small Molecule for Efficient Hole Transport in High-Performance p-i-n Type Perovskite Solar Cells

Accepted version
Peer-reviewed

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Article

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Authors

Yang, L 
Cai, F 
Yan, Y 
Li, J 
Liu, D 

Abstract

jats:pThe π‐conjugated organic small molecule 4,4′‐cyclohexylidenebis[jats:italicN</jats:italic>,jats:italicN</jats:italic>‐bis(4‐methylphenyl) benzenamine] (TAPC) has been explored as an efficient hole transport material to replace poly(3,4‐ethylenedio‐xythiophene):poly(styrenesulfonate) (PEDOT:PSS) in the preparation of p‐i‐n type CHjats:sub3</jats:sub>NHjats:sub3</jats:sub>PbIjats:sub3</jats:sub> perovskite solar cells. Smooth, uniform, and hydrophobic TAPC hole transport layers can be facilely deposited through solution casting without the need for any dopants. The power conversion efficiency of perovskite solar cells shows very weak TAPC layer thickness dependence across the range from 5 to 90 nm. Thermal annealing enables improved hole conductivity and efficient charge transport through an increase in TAPC crystallinity. The perovskite photoactive layer cast onto thermally annealed TAPC displays large grains and low residual PbIjats:sub2</jats:sub>, leading to a high charge recombination resistance. After optimization, a stabilized power conversion efficiency of 18.80% is achieved with marginal hysteresis, much higher than the value of 12.90% achieved using PEDOT:PSS. The TAPC‐based devices also demonstrate superior stability compared with the PEDOT:PSS‐based devices when stored in ambient circumstances, with a relatively high humidity ranging from 50 to 85%.</jats:p>

Description

Keywords

hole transport, perovskites, planar heterojunction, solar cells, TAPC

Journal Title

Advanced Functional Materials

Conference Name

Journal ISSN

1616-301X
1616-3028

Volume Title

27

Publisher

Wiley
Sponsorship
Engineering and Physical Sciences Research Council (EP/M024873/1)