Cooperative Effect of Carbon Nanotubes and Dimethyl Sulfoxide on PEDOT:PSS Hole Transport Layer in Planar Perovskite Solar cells

doi:10.15541/jim20170380

Abstract

Abstract:

Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) film is commonly used as hole transport layer in planar perovskite solar cells (PSCs). To further strengthen the charge transport within PEDOT:PSS film and boost the growth of the perovskite crystal on PEDOT:PSS film, carbon nanotubes (CNTs) and dimethyl sulfoxide (DMSO) were simultaneously used as additives to prepare the co-modified film of CNT-DMSO-PEDOT:PSS. Results demonstrate an advantageous cooperative effect of CNTs and DMSO on the co-modified film. The dispersed CNTs with a grid-like structure throughout PEDOT:PSS matrix plays dual roles: to promote the perovskite crystal growth on co-modified surface and to reduce the sheet resistance of the co-modified film, while DMSO improves the conductivity of the co-modified film and controls the loss of CNTs from the co-modified film. Due to the cooperative effect, co-modified film is significantly more capable to collect, transport charges and enhance the perovskite layer growth with larger grains on its surface than that with pristine PEDOT:PSS film or PEDOT:PSS films modified by a single additive of CNT or DMSO, CNT-PEDOT:PSS or DMSO-PEDOT:PSS. Meanwhile, the co-modified film maintains high transparency with a transmittance of 88.8% at 550 nm. As a result, the PSCs of co-modified film has a hig power conversion efficiency of 5.75% in contrast to the devices based on the CNT-PEDOT:PSS (3.01%), DMSO-PEDOT:PSS (2.03%) and pristine PEDOT:PSS (1.30%) films.

Key words: carbon nanotubes, dimethyl sulfoxide, PEDOT:PSS, hole transport layer, perovskite solar cells

CLC Number:

TM914

XU Shun-Jian, XIAO Zong-Hu, LUO Xiao-Rui, ZHONG Wei, LOU Yong-Ping, OU Hui. Cooperative Effect of Carbon Nanotubes and Dimethyl Sulfoxide on PEDOT:PSS Hole Transport Layer in Planar Perovskite Solar cells[J]. Journal of Inorganic Materials, 2018, 33(6): 641-647.

Figures/Tables 9

Fig. 1 SEM and AFM images of different PEDOT:PSS films.(a, d) DMSO-PEDOT:PSS; (b, e) CNT-PEDOT:PSS; (c, f) CNT-DMSO-PEDOT:PSS

Fig. 2 UV-Vis spectra of different PEDOT:PSS films in the visible range

Fig. 3 Sheet resistances of (a) pristine PEDOT:PSS, (b) DMSO-PEDOT:PSS, (c) CNT-PEDOT:PSS, and (d) CNT-DMSO- PEDOT:PSS films on ITO substrates

Fig. 4 FT-IR spectra of CNT-DMSO-PEDOT:PSS co-modified film and pristine PEDOT:PSS film

Fig. 5 AFM images and grain size distributions of CH3NH3PbI3 perovskite layers deposited on different PEDOT:PSS films(a) DMSO-PEDOT:PSS; (b) CNT-PEDOT:PSS; (c) CNT- DMSO-PEDOT:PSS

Fig. 6 J-V curves of best PSCs consisting of different PEDOT:PSS films as hole transport layers

Fig.7 Statistic PCE of PSCs employing the hole transport layers of (a) pristine PEDOT:PSS, (b) DMSO-PEDOT:PSS, (c) CNT-PEDOT:PSS and (d) CNT-DMSO-PEDOT:PSS

Table 1 Best photovoltaic performances of PSCs employing various PEDOT:PSS films as hole transport layers

HTL	J_sc/(mA∙cm^-2)	V_oc/V	FF	PCE/%
Pristine PEDOT:PSS	6.67	0.60	0.32	1.30
DMSO-PEDOT:PSS	13.49	0.51	0.30	2.03
CNT-PEDOT:PSS	14.71	0.61	0.34	3.01
Co-modified film	15.63	0.77	0.48	5.75

Fig. 8 UPS spectrum of CNT-DMSO-PEDOT:PSS co-modified film with insert showing energy band diagram of device employing PEDOT:PSS hole transport layer

References 28

[1]	WANG WEI-QI, ZHENG HUI-FENG, LU GUAN-HONG,et al. Recent progress on applications of nano metal oxides in perovskite solar cells. Journal of Inorganic Materials, 2016, 31(9): 897-907.
[2]	AITOLA KERTTU, SVEINBJORNSSON KAN, CORREA-BAENA JUAN-PABLO,et al. Carbon nanotube-based hybrid hole- transporting material and selective contact for high efficiency perovskite solar cells. Energy & Environmental Science, 2016, 9(2): 461-466.
[3]	YANG WOON SEOK, NOH JUN HONG, JEON NAM JOONG,et al. High-performance photovoltaic perovskite layers fabricated through intramolecular exchange. Science, 2015, 348(6240): 1234-1237.
[4]	LEE MICHAEL M, TEUSCHER JOEL, MIYASAKA TSUTOMU,et al. Efficient hybrid solar cells based on meso-superstructured organometal halid eperovskites. Science, 2012, 338(6107): 643-647.
[5]	LIU XIAODONG, YU HAO, YAN LI,et al. Triple cathode buffer layers composed of PCBM, C60, and LiF for high-performance planar perovskite solar cells. ACS Applied Materials & Interfaces, 2015, 7(11): 6230-6237.
[6]	ZUO CHUANTIAN, DING LIMING.Modified PEDOT layer makes a 1.52 VVoc for perovskite/PCBM solar cells. Advanced Energy Materials, 2017, 7(2): 1601193.
[7]	HUANG DI, GOH TENGOOI, KONG JAEMIN,et al. Perovskite solar cells with a DMSO-treated PEDOT:PSS hole transport layer exhibit higher photovoltaic performance and enhanced durability. Nanoscale, 2017, 9(12): 4236-4243.
[8]	GIURI ANTONELLA, MASI SOFIA, COLELLA SILVIA,et al. Cooperative effect of GO and glucose on PEDOT:PSS for high VOC and hysteresis-free solution-processed perovskite solar cells. Advanced Functional Materials, 2016, 26(38): 6985-6994.
[9]	HUANG XU, WANG KAI, YI CHAO,et al. Efficient perovskite hybrid solar cells by highly electrical conductive PEDOT:PSS hole transport layer. Advanced Energy Materials, 2016, 6(3): 1501773.
[10]	SUN KUAN, LI PENGCHENG, XIA YIJIE,et al. Transparent conductive oxide-free perovskite solar cells with PEDOT:PSS as transparent electrode. ACS Applied Materials & Interfaces, 2015, 7(28): 15314-15320.
[11]	WU ZHONGWEI, BAI SAI, XIANG JIAN,et al. Efficient planar heterojunction perovskite solar cells employing graphene oxide as hole conductor. Nanoscale, 2014, 6(18): 10505-10510.
[12]	ANTIOHOS DENNIS, FOLKES GLENN, SHERELL PETER, et al. Compositional effects of PEDOT-PSS/single walled carbon nanotube films on supercapacitor device performance.Journal of Materials Chemistry, 2011, 21(40): 15987-15994.
[13]	SHIN NA-RI, CHOI SUL-HWA, KIM JIN-YEOL.Highly conductive PEDOT:PSS electrode films hybridized with gold- nanoparticle-doped-carbon nanotubes.Synthetic Metals, 2014, 192(12): 23-28.
[14]	ZHANG YONG, TAN LICHENG, FU QINGXIA,et al. Enhancing the grain size of organic halide perovskites by sulfonate-carbon nanotube incorporation in high performance perovskite solar cells. Chemical Communications, 2016, 52(33): 5674-5677.
[15]	MA XIAOPIN, WANG XIUYU, LI MINGXIU,et al. A highly conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) film with the solvent bath treatment by dimethyl sulfoxide as cathode for polymer tantalum capacitor. Chemical Physics Letters, 2016, 654: 86-91.
[16]	XIONG SHANXIN, ZHANG LIYING, LU XUEHONG.Conductivities enhancement of poly(3,4-ethylenedioxythiophene)/poly (styrene sulfonate) transparent electrodes with diol additives.Polymer Bulletin, 2013, 70(1): 237-247.
[17]	YOO DOHYUK, KIM JEONGHUN, KIM JUNG HYUN.Direct synthesis of highly conductive poly(3,4-ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS)/graphene composites and their applications in energy harvesting systems.Nano Reseach, 2014, 7(5): 717-730.
[18]	JIANG QINGLIN, LIU CONGCONG, SONG HAIJUN,et al. Free-standing PEDOT:PSS film as electrode for the electrodeposition of bismuth telluride and its thermoelectric performance. International Journal of Electrochemical Science, 2014, 9(12): 7540-7551.
[19]	PARK JONGWOON, LEE ARI, YIM YOUNCHAN,et al. Electrical and thermal properties of PEDOT:PSS films doped with carbon nanotubes. Synthetic Metals, 2011, 161(5/6): 523-527.
[20]	RATTAN SUNITA, SINGHAL PRACHI, VERMA A L.Synthesis of PEDOT:PSS (poly(3,4-ethylenedioxythiophene)/poly(4- styrene sulfonate))/NGPs (nanographitic platelets) nanocomposites as chemiresistive sensors for detection of nitroaromatics.Polymer Engineering and Science, 2013, 53(10): 2045-2052.
[21]	WANG QI, DONG QINGFENG, LI TAL,et al. Thin insulating tunneling contacts for efficient and water-resistant perovskite solar cells. Advanced Materials, 2016, 28(31): 6734-6739.
[22]	YU YU, YANG SONGWANG, LEI LEI,et al. Nucleation mediated interfacial precipitation for architectural perovskite films with enhanced photovoltaic performance. Nanoscale, 2017, 9(7): 2569-2578.
[23]	HUANG XU, GUO HENG, YANG JIAN,et al. Moderately reduced graphene oxide/PEDOT:PSS as hole transport layer to fabriccate efficient perovskite hybrid solar cells. Organic Electronics, 2016, 39: 288-295.
[24]	LEE DA-YOUNG, NA SEOK-IN, KIM SEOK-SOON.Graphene oxide/PEDOT:PSS composite hole transport layer for efficient and stable planar heterojunction perovskite solar cells.Nanoscale, 2016, 8(3): 1513-1522.
[25]	LEE JIYONG, MENAMPARAMBATH MINI MOL, HWANG JAE-YEOL,et al. Hierarchically structured hole transport layers of spiro-OMeTAD and multiwalled carbon nanotubes for perovskite solar cells. ChemSusChem, 2015, 8(14): 2358-2362.
[26]	CHRISTIANS JEFFREY A, FUNG RAYMOND C M, KAMAT PRASHANT V. An inorganic hole conductor for organo-lead halide perovskite solar cells. improved hole conductivity with copper iodide.Journal of the American Chemical Society, 2014, 136(2): 758-764.
[27]	KUANG CHAOYANG, TANG GANG, JIU TONGGANG,et al. Highly efficient electron transport obtained by doping PCBM with graphdiyne in planar-heterojunction perovskite solar cells. Nano Letters, 2015, 15(4): 2756-2762.
[28]	ZHOU HUANPING, CHEN QI, LI GANG,et al. Interface engineering of highly efficient perovskite solar cells. Science, 2014, 345(6196): 542-564.