Perovskite Film Passivated by Fmoc-FF-OH and Its Photovoltaic Performance

doi:10.15541/jim20230050

Abstract

Abstract:

Organic-inorganic hybrid perovskite is an ideal light absorption material due to its high light absorption coefficient, adjustable band gap and bipolar charge conduction characteristics. However, perovskite thin films prepared by solution method possess various defects in the surface and interface, which inhibit carrier transport and trigger recombination. In this study, a multifunctional amino acid derivative, 9-fluorenylmethoxycarbonyl- L-phenylalanine-L-phenylalanine (Fmoc-FF-OH), was selected as an additive to reduce defects of perovskite film and to inhibit carrier recombination at grain boundaries. When the concentration of Fmoc-FF-OH is 0.6 g·L^-1, the particle size of the perovskite thin film increases from 138 to 210 nm, and the defect state density decreases from 2.46×10¹⁵ to 2.17×10¹⁵cm^-3. Perovskite solar cells also exhibit optimal performance with open circuit voltage increasing from 1.05 to 1.10 V, and photoelectric conversion efficiency (PCE) improved from 15.50% to 17.44%. After stability test for 220 h, the photoelectric conversion efficiency of the device can still maintain 71% of the initial.

Key words: perovskite solar cell, interface passivation, amino acid derivative

CLC Number:

TQ174

DING Tongshun, FENG Ping, SUN Xuewen, SHAN Husheng, LI Qi, SONG Jian. Perovskite Film Passivated by Fmoc-FF-OH and Its Photovoltaic Performance[J]. Journal of Inorganic Materials, 2023, 38(9): 1076-1082.

Figures/Tables 12

Fig. 1 (a) Molecular structure of Fmoc-FF-OH and (b) XRD patterns of perovskite films with different concentrations of Fmoc-FF-OH

Fig. 2 SEM images and particle size distributions of perovskite films with different Fmoc-FF-OH concentrations (a) 0 g·L-1; (b) 0.2 g·L-1; (c) 0.4 g·L-1; (d) 0.6 g·L-1; (e) 0.8 g·L-1

Fig. 3 (a) Pb4f, (b) Br3d XPS spectra of perovskite films without and with addition of 0.6 g·L-1 Fmoc-FF-OH

Fig. 4 (a) PL spectra, (b) UV-Vis spectra and (c) TRPL spectra of perovskite thin films with different concentrations of Fmoc-FF-OH; Colorful figures are available on website

Fig. 5 Effects of addition of Fmoc-FF-OH on the PSCs photovoltaic performance (a) J-V curves of PSCs with different concentrations of Fmoc-FF-OH; (b) Forward and reverse J-V curves for PSCs, (c) IPCE and integral current curves, (d) pure hole I-V curves under dark conditions and (e) electrochemical impedance spectra of PSCs without and with 0.6 g·L-1 Fmoc-FF-OH Colorful figures are available on website

Table 1 Photovoltaic parameters of PSCs with different concentrations of Fmoc-FF-OH

Concentration (g·L^-1)	Direction	V_OC/V	J_SC/(mA·cm^-2)	FF/%	PCE/%	Hysteresis Index
0	Reverse	1.05	19.28	76.05	15.50	0.11
0	Forward	1.02	17.53	74.76	13.39	0.11
0.2	Reverse	1.06	19.23	78.74	16.12	—
0.4	Reverse	1.06	19.37	78.37	16.24	—
0.6	Reverse	1.10	19.94	79.47	17.44	0.07
0.6	Forward	1.09	19.03	77.36	16.10	0.07
0.8	Reverse	1.07	18.94	77.98	15.91	—

Fig. 6 (a) PCE stability test for PSCs devices without and with 0.6 g·L-1 Fmoc-FF-OH; (b) Constant voltage current curves of PSCs with 0.6 g·L-1 Fmoc-FF-OH

Fig. S1 Structure diagram of PSCs device

Fig. S2 (a)Total and (b) I3d, (c) Cs3d XPS spectra of perovskite thin films without and with addition of 0.6 g·L-1 Fmoc-FF-OH

Fig. S3 Tauc plots perovskite thin films (a) without and (b) with addition of 0.6 g·L-1 Fmoc-FF-OH

Table S1 TRPL fitting parameters of perovskite films with addition of different concentrations of Fmoc-FF-OH

Concentration (g·L^-1)	A₁	τ₁/ns	A₂	τ₂/ns	τ_ave/ns
0	12.03	4	87.97	125	124.47
0.2	11.12	7	88.88	133	132.17
0.4	5.04	10	94.98	231	230.49
0.6	0.12	6	99.88	332	331.99
0.8	3.79	8	96.21	226	225.67

Fig. S4 Contact Angles of perovskite films (a) without and (b) with 0.6 g·L-1 Fmoc-FF-OH

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