Performance of Perovskite solar cells Doped with L-arginine

doi:10.15541/jim20210421

Abstract

Abstract:

Perovskite solar cells have become a research hotspot in the field of new energy due to the excellent performance and potential in application, but it still displays some disadvantages such as high defect density and poor stability. In this study, L-arginine, a small molecule of organic matter, was doped into the perovskite precursor soLution as compared with the other amino acids, and the perovskite solar cells were prepared by a two-element and two-step preparation method. The test results show that L-arginine doping improves the photoelectric performance of the device, which photoelectric efficiency increases from 18.81% to 21.86%. L-arginine reduces the nonradiative recombination of carriers and increases the average carrier life by reducing the defect density of perovskite layer from 4.83×10¹⁶ cm^-3 to 3.45×10¹⁶ cm^-3. In addition, the perovskite grain size increases, grain boundaries decrease, the light absorption ability and stability of the film are enhanced, while the hysteresis effect is suppressed. Improvement of the photovoltaic performance is due to the passivation of defects by interaction between multi-groups of L-arginine and perovskite materials. This study provides an optimization method for perovskite solar cells.

Key words: perovskite solar cell, defect passivation, L-arginine, doping modification

CLC Number:

TM914

JIAO Boxin, LIU Xingchong, QUAN Ziwei, PENG Yongshan, ZHOU Ruonan, LI Haimin. Performance of Perovskite solar cells Doped with L-arginine[J]. Journal of Inorganic Materials, 2022, 37(6): 669-675.

Figures/Tables 11

Fig. 1 (a) MolecuLar structure of L-arginine and (b) n-i-p type device structure

Fig. S1 Molecular structure of amino acid dopants

Fig. S2 (a) Top view of PbI type defects and (b) PCE box distributions of PSCs doped with different amino acids

Fig. 2 (a, b) Typical SEM images and (c, d) AFM images of perovskite films (a, c) without and (b, d) with L-arginine doping

Fig. 3 (a) XRD patterns, (b) UV-Vis spectra, (c) FT-IR spectra, and (d) local amplification of (c) for undoped and doped perovskite films without and with L-arginine doping Colorful figures are available on website

Fig. 4 (a) PL spectra, (b) TRPL spectra and fitting resuLts of perovskite films with and without L-arginine doping Colorful figures are available on website

Fig. 5 (a) PCE box/normal distribution, (b) J-V curves, (c) IPCE and integral current density curves, and (d) forward and reverse scan J-V curves of PSCs with and without L-arginine doping Colorful figures are available on website

Table 1 Photoelectric parameters of PSCs doped with different concentrations of L-arginine

Concentration/ (mg·L^-1)	J_SC/(mA·cm^-2)	V_OC/V	FF/%	PCE/%
0	21.80	1.119	77.1	18.81
40	22.20	1.121	77.0	19.15
60	22.55	1.131	78.6	20.03
80	23.68	1.143	80.8	21.86
100	22.74	1.131	79.4	20.42

Fig. 6 SCLC curve of PSCs (a) undoped and (b) doped with L-arginine, (c) EIS impedance spectra and (d) dark J-V curves of PSCs with and without L-arginine doping PC61 BM: [6,6]-phenyl-C61-butyric acid methyl ester

Fig. S3 (a)XRD patterns and (b)EIS impedance spectra of perovskite films doped with different amino acids

Fig. 7 (a) Current and voltage stability tests for 400 s, and (b) device stability tests for 480 h of PSCs with and without L-arginine doping

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