Influence of Crack-defect on Perovskite Solar Cells Performance†

doi:10.7503/cjcu20170285

Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (3): 545.doi: 10.7503/cjcu20170285

• Physical Chemistry • Previous Articles Next Articles

Influence of Crack-defect on Perovskite Solar Cells Performance^†

LIU Guozhen^1,², YE Jiajiu^1,², HOU Zhaosheng³, CHEN Shuanghong¹, HU Linhua¹, PAN Xu^1,^*(), DAI Songyuan⁴

1. Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230088, China
2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
3. College of Chemistry, Chemical Engineering and Materials Science,Shandong Normal University, Jinan 250014, China
4. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University, Beijing 102206, China

Received:2017-05-05 Online:2018-03-10 Published:2018-01-23
Contact: PAN Xu E-mail:xpan@rntek.cas.cn
Supported by:
† Supported by the National High Technology Research and Development Program of China(No.2015AA050602), the National Natural Science Foundation of China(No.61404142) and the External Cooperation Program of BIC, Chinese Academy of Sciences(No;GJHZ1607)

Abstract

Abstract:

The influences of crack-defect on the quality of perovskite light absorber and the photovoltaic performance of (FAPbI₃)_0.85(MAPbBr₃)_0.15 perovskite solar cells(PSC) were investigated. The scanning electron microscopy, X-ray diffraction, UV-Vis absorption and transient absorption, static photoluminescence spectroscopies were carried out to study the differences in the devices with and without crack-defect. The experimental results show that, when there are obvious cracks on the surface, the films have worse crystallinity and weaker absorption, which could lead to the decrease of carrier extraction efficiency and increase of internal electron-hole recombination. As a result, the power conversion efficiency(PCE) of PSC with crack-defect is only 15.74%, while that of PSC without crack-defect show the highest PCE of 18.22%. Therefore, acquiring high quality of pe-rovskite thin film without crack-defect can reduce internal electron-hole recombination, improve carrier extraction efficiency and be beneficial to further enhance the photovoltaic performance of perovskite solar cells.

Key words: Perovskite solar cell, Crack-defect, Photovoltaic performance

CLC Number:

O649.4

TrendMD:

LIU Guozhen, YE Jiajiu, HOU Zhaosheng, CHEN Shuanghong, HU Linhua, PAN Xu, DAI Songyuan. Influence of Crack-defect on Perovskite Solar Cells Performance^†[J]. Chem. J. Chinese Universities, 2018, 39(3): 545.

Figures/Tables 7

Fig.1 Real images of the perovskite thin films without(A) and with(B) crack-defect

Fig.2 Cross-sectional(A,C) and top-surface(B,D) SEM images of the perovskite thin films with(A,B) and without(C,D) crack-defect

Fig.3 XRD patterns(A) and UV-Vis absorption spectra(B) of perovskite thin films without(a) and with(b) crack-defect

Fig.4 Normalized transient absorption responses of perovskite thin films without(A) and with(B) crack-defect and theoretical fitting results of the transient absorption responsePump light wavelength: 500 nm; probe light wavelength: 760 nm.

Fig.5 Photoluminescence spectra of perovskite thin films without(a) and with(b) crack-defectλex=473 nm.

Fig.6 Current density-voltage curves under reverse(a, b) and forward(a', b') scan directions(A) and internal photo-to-current efficiency measurement and the corresponding integral current density(B) of perovskite solar cells without(a, a') and with(b, b') crack-defect

Table 1 Photovoltaic parameters of perovskite solar cells with and without crack-defect

Solar cell	Scanning direction	J_sc/(mA·cm^-2)	V_oc/V	FF(%)	PCE(%)
With crack-defect	Reverse	22.08	1.09	75.46	18.22
	Forward	21.31	1.08	73.11	16.85
Without crack-defect	Reverse	20.34	1.06	73.04	15.74
	Forward	18.66	1.04	69.75	11.09

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Influence of Crack-defect on Perovskite Solar Cells Performance^†

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