Passiviation of L-3-(4-Pyridyl)-alanine on Interfacial Defects of Perovskite Solar Cell

doi:10.15541/jim20200495

Abstract

Abstract:

In recent years, perovskite materials become a research hotspot in the field of solar cells due to their excellent photovoltaic properties, but control of their interface defects still remains one of the key problems to be solved. In this study, an organic small molecule additive (L-3-(4-pyridyl)-alanine (PLA)) was introduced in the preparation of perovskite photoabsorption layer by two-step solution method. The characterizations showed that the introduction of PLA could comprehensively improve photoelectric performance of the device, with optimal energy conversion efficiency of 21.53%, in contrast to that of the reference device (20.10%). Further studies showed that PLA could reduce the trap state density of the device from 5.59×10¹⁶cm^-3 to 3.40×10¹⁶cm^-3, promote the interface charge extraction, and decrease the carrier recombination. The above improvements can be attributed to the PLA induced PbI₂ enrichment at grain boundaries and PLA anchoring at defects, which play an important roles in passivate defects. This study can provide guideline for further regulating the defects of perovskite solar cells.

Key words: perovskite solar cell, additive with multifunctional groups, trap state density, carrier recombination

CLC Number:

O649

LIU Wenwen, HU Zhilei, WANG Li, CAO Mengsha, ZHANG Jing, ZHANG Jing, ZHANG Shuai, YUAN Ningyi, DING Jianning. Passiviation of L-3-(4-Pyridyl)-alanine on Interfacial Defects of Perovskite Solar Cell[J]. Journal of Inorganic Materials, 2021, 36(6): 629-636.

Figures/Tables 11

Fig. 1 (a) Molecular structure of PLA and (b) schematic diagram of PSC device with PLA

Fig. 2 (a,b) Surface and (c,d) cross sectional SEM images, (e,f) grain size distributions of FTO/TiO2/perovskite films (a, c, e) without and (b, d, f) with PLA

Fig. 3 (a) ATR-FT-IR spectra, ((b) magnified ATR-FT-LR spectra of rectangular area in (a)), (c) UV-Vis absorption spectra and (d) XRD patterns of FTO/TiO2/perovskite films with and without PLA

Table 1 Mean values and standard deviation (SD) of photovoltaic parameters for PSC devices without and with PLA

Device	J_SC(SD)/(mA·cm^-2)	V_OC(SD)/V	FF(SD)/%	PCE(SD)/%
Without PLA	23.84(0.74)	1.07(0.02)	76.80(1.15)	19.49(0.48)
With PLA	24.37(0.50)	1.07(0.02)	78.74(1.43)	20.55(0.39)

Fig. 4 Statistical deviations of (a)JSC, (b)VOC, (c) FF, and (d) PCE for PSC devices without and with PLA

Fig. 5 Forward and reverse scan J-V curves of the optimal PSC devices (a) without and (b) with PLA, (c) comparison of the reverse J-V curves, and (d) external quantum efficiency spectra and integrated JSC curves for the optimal PSC devices without and with PLA

Fig. 6 (a) PL spectra, (b) TRPL spectra (λexcitation=510 nm) and TRPL fitting results of glass/perovskite films with and without PLA

Fig. 7 (a) Schematic diagram of electron-only perovskite film device with PLA, and (b) SCLC measurements of electron-only perovskite film devices with and without PLA

Fig. S1 (a,b) Surface and (c,d) cross sectional SEM images of FTO/TiO2/PbI2 film without PLA (a, c) and with PLA (b, d)

Fig. S2 EIS plots of PSC without and with PLA (a) under illumination and (b) in dark

Table S1 EIS fitting parameters of PSC without and with PLA under illumination and in dark

Device	R_S/ (Ω·cm^-2)	R₁/ (Ω·cm^-2)	R₂/ (Ω·cm^-2)
Without PLA (Illumination)	1.80	58.70	7.90
With PLA (Illumination)	1.43	15.74	40.49
Without PLA (Dark)	0.78	3.46×10⁵	2.27×10⁴
With PLA (Dark)	1.21	2.15×10⁴	4.50×10⁵

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