Abstract
Sb2S3 is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency (PCE).However,the poor quality and high trap states of Sb2S3 films limit the device performance further enhancement.Herein,we adopt a multidentate ionic liquid,tetramethylammonium hexafluorophosphate ([TMA][PF6])as a novel additive to address this issue.The octahedral[PF6]-contains six different oriented fluorine atoms with the lone pair electrons,which could coordinate with Sb atoms due to the multidentate anchor-ing.Thus,the high-quality Sb2S3 film with low trap states has been achieved.Moreover,the Fermi level of the Sb2S3 film has been upshifted,thereby showing an effective charge transfer.As a result,all photo-voltaic parameters of the optimized Sb2S3 devices are obviously enhanced,boosting the final PCE from 4.43 (control device) to 6.83 ％.Our study about the multidentate anchoring is manifested to be an effective method to enhance the Sb2S3 device performance.
基金项目
Basic Research Fund for Free Exploration in Shenzhen(JCYJ20180306171402878)
National Natural Science Foundation of China(52072228)
National Natural Science Foundation of China(51571166)
National Natural Science Foundation of China(21603175)
Fundamental Research Funds for the Central Universities(3102019JC005)
NETL
NSTL
万方数据