在钙钛矿太阳能电池领域，如何改善空穴传输层（
HTL
）与钙钛矿吸收层之间的界面特性，一直是提升反式
PSC
性能的关键挑战之一。近日，韩国国立
釜庆大学李富强
&Sung Heum Park
团队在这一领域取得了重要突破，其最新研究成果提出了一种高效的功能补偿层（
FCL
）设计，为钙钛矿太阳能电池的性能和稳定性带来了显著提升，相关成果发表于
Small
期刊。
研究团队采用一种基于苯并噻吩衍生物的新型功能补偿层，特别是
5-(
三氟甲基
)-1-
苯并噻吩
-2-
羧酸（
TFMBTA
），将其引入到
MeO-2PACz HTL
与钙钛矿吸收层之间。该功能补偿层通过改善
HTL
表面形貌、优化能级匹配，有效增强了电荷传输与空穴提取效率，同时提升了钙钛矿薄膜的沉积质量。此外，
TFMBTA
的功能基团对钙钛矿缺陷具有出色的钝化效果，大幅减少了
HTL
与钙钛矿层界面的非辐射复合损失。
实验结果显示，引入
TFMBTA
功能补偿层的
MeO-2PACz
基
PSC
实现了
23.85%
的光电转换效率，开路电压、填充因子以及长期稳定性均得到显著提升。同样，在
PEDOT:PSS HTL
与钙钛矿层之间引入该功能补偿层，也表现出了效率和稳定性的同步增强，验证了功能补偿层在多种
HTL
上的通用性。
Figure 1.
a) The structure of
TFMBTA. b) Description of TFMBTA as FCL c) High-resolution XPS spectra of F 1s
region before and after adsorption of TFMBTA. d) The In 3d XPS spectra of ITO
surfaces with TFMBTA treatment, MeO-2PACz treatment, and MeO-2PACz/TFMBTA treatment,
respectively. e) XPS spectra of C 1s for film of ITO/TFMBTA. f) XPS spectra of
F 1s of TFMBTA‐treated films before and after solvent washing. g) XPS spectra
of In 3d of TFMBTA‐treated films before and after solvent washing. h) FTIR
spectrum of TFMBTA, MeO‐2PACz, and TFMBTA·MeO‐2PACz mixture.
Figure 2.
SEM images of the a) MeO-2PACz
and b) TFMBTA-treated films. 3D AFM images of c) MeO-2PACz and d) TFMBTA-treated
MeO-2PACz films. e) The contact angles of water on the MeO-2PACz and TFMBTA-treated
MeO-2PACz films. f) J-V curves of the hole-only devices to evaluate the hole
transport ability of ITO/MeO-2PACz (with or without TFMBTA)/MoO
x
/Ag.
g) Band alignment of the PSCs after TFMBTA treatment.
Figure 3.
a) Schematic diagram of
perovskite passivation by TFMBTA b) ESP result of the TFMBTA and TFMBA.
Theoretical model of the interaction between C=O group and perovskite of c)
TFMBTA and d) TFMBA and the calculated binding energy and charge density
difference.
Figure 4.
a) FTIR spectra of
TFMBTA powder and TFMBTA·PbI
2
blend. b) FTIR spectra of TFMBTA
powder and TFMBTA·FAI blend at 900–1200 cm
-1
. XPS spectra of c) Pb
4f for pristine and TFMBTA-treated perovskite films. d) 13C NMR spectra of
TFMBTA and TFMBTA·PbI
2
mixture. e) 19F and f) 1H NMR spectra of
TFMBTA and TFMBTA·FAI mixture.
