Study on the Performance of Planar Perovskite Solar Cells Based on Organic Small-molecule Dopants for the Photosensitive Layer
WANG Binbin
MENG Luyao
LIU Zhendong
ZHOU Zhongyuan
MENG Lanxiang
SUN Yu
MA Jianguo
SU Minging
GAO Yunjiao
Abstract：To improve the photoelectric conversion efficiency of perovskite solar cells(PSCs)by introducing organic small-molecule dopants for the photosensitive layer,this study focuses on inverted-structured PSCs.A new organic small-molecule dopant,5-bromopyridine-2,3-dicarboxylic acid(BDA),was introduced into the photosensitive layer of PSCs,and planar PSCs were assembled accordingly.The prepared PSCs devices were characterized using scanning electron microscopy(SEM),X-ray diffraction(XRD),current-voltage(J-V)characteristics,and other techniques to analyze the influence law of BDA on perovskite film quality and carrier transport capacity,and further explore the mechanism by which BDA improves the photoelectric conversion efficiency of PSCs devices.Research results show that multiple functional groups in BDA have a passivation effect on internal defects of perovskite crystals,inhibiting the formation of defects such as MA⁺,I⁻,and metallic Pb⁰ in perovskite films,and reducing photoelectron energy loss caused by nonradiative recombination of electrons and holes.This is conducive to the formation of high-quality perovskite films,thereby improving the photoelectric conversion efficiency of the devices.In addition,the regulation of BDA on the energy level of perovskite films also enhances the carrier extraction and transport capabilities of the devices.PSCs based on BDA doping achieved a photoelectric conversion efficiency of 13.42%,outperforming undoped PSCs in overall performance.As a low-cost photosensitive layer dopant,the successful introduction of BDA provides a new research strategy for preparing high-efficiency planar perovskite solar cells.
Keywords：dopantorganic small moleculeperovskite solar cellsphotosensitive layernonradiative recombination
Publication Date：2026-03-20
Online Publishing Date：2026-03-31(First online date of this platform, not the publication date of the document)
Pages：9( 49-57 )