doi:10.11777/j.issn1000-3304.2018.17297

引用本文: 崔勇, 姚惠峰, 杨晨熠, 张少青, 侯剑辉. 具有接近15%能量转换效率的有机太阳能电池[J]. 高分子学报, 2018, (2): 223-230. doi: 10.11777/j.issn1000-3304.2018.17297 shu

Citation: Cui Yong, Yao Hui-feng, Yang Chen-yi, Zhang Shao-qing and Hou Jian-hui. Organic Solar Cells with an Efficiency Approaching 15%[J]. Acta Polymerica Sinica, 2018, (2): 223-230. doi: 10.11777/j.issn1000-3304.2018.17297 shu

具有接近15%能量转换效率的有机太阳能电池

中国科学院化学研究所高分子物理与化学国家重点实验室北京 100190

通讯作者: 侯剑辉, 侯剑辉, E-mail: hjhzlz@iccas.ac.cn

摘要: 对叠层有机太阳能电池中的前、后子电池之间的光谱匹配性进行了优化调制.最终，选用带隙为1.24 eV的PTB7-Th：IEICO-4F作为后电池，带隙为1.59 eV的J52-2F：IT-M作为前电池制备了叠层电池.在这个叠层有机太阳能电池中，这2个子电池不仅具有互补的吸收光谱，还具有高的外量子效率，实现了对300~1000 nm范围内太阳发射光谱的高效利用.此外，前、后电池的能量损失均得到有效的控制，分别为0.64和0.53 eV.因此，从光伏性能具体参数上来看，本文制备的叠层器件兼具了高短路电流密度（J_SC）和高开路电压（V_OC）的优势，分别达到13.3 mA/cm²和1.65 V.该电池在本实验室内部测试的光伏效率高达14.9%，封装之后效率略有降低，由中国计量科学研究院（NIM）验证的光伏效率达到14.0%.这是目前有机光伏领域的国际最高结果.

关键词:

English

Organic Solar Cells with an Efficiency Approaching 15%

State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190

Corresponding author: Jian-hui Hou, E-mail: hjhzlz@iccas.ac.cn

Received Date: 2017-10-26
Accepted Date: 2017-11-09
Available Online: 2018-02-20

Abstract: In this work, we focus on the fine-tuning of absorption spectra to achieve well-matched light response and reducing the energy loss (E_loss=E_g^opt-e^*V_OC, where E_g^opt is the optical bandgap, and V_OC is the open circuit voltage) for the sub-cells of tandem organic solar cells (OSCs) to improve photovoltaic performance. We select PTB7-Th:IEICO-4F with a band gap of 1.24 eV as the rear cell and J52-2F:IT-M with a band gap of 1.59 eV as the front cell to fabricate the tandem OSCs. The absorption spectra of PTB7-Th:IEICO-4F is mainly located in the region of 600-950 nm, while that of J52-2F:IT-M is mainly located in the region of 450-750 nm. Their response spectra are very complementary, and both of the sub-cells show high external quantum efficiency, prompting the tandem OSCs to realize high-efficiency utilization of solar spectrum in the range of 300-1000 nm. In this tandem OSC, the E_loss in both front and rear cells are also effectively controlled to be 0.64 and 0.53 eV, respectively. In addition, an efficient interconnection layer (ICL) of ZnO/PCP-Na is used to connect the front and the rear sub-cells, which shows outstanding diode characteristics and high light transmittance in the long wavelength direction. In view of these excellent properties, the tandem solar cells manufactured in this work possess the advantages of high short-circuit current density (J_SC) and V_OC, reaching 13.3 mA/cm² and 1.65 V, respectively. The highest power conversion efficiency (PCE) of the tandem OSC reaches 14.9%. The device parameters decrease slightly after encapsulation due to the intense ultraviolet irradiation, and a certified PCE of 14.0%, with a V_OC of 1.64 V, a J_SC of 12.9 mA/cm², and a fill factor (FF) of 0.664, recorded by National Institute of Metrology (NIM), China. This result is the best obtained in the organic photovoltaic field.

Key words:

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Figure 1. (a) Molecular structures and (b) normalized absorption spectra of the photoactive materials for rear cells; (c) Molecular structures and (d) normalized absorption spectra of the photoactive materials for front cells

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Figure 2. Integrated current density from the AM1.5G photon flux

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Figure 3. (a) J-V curves and (b) EQE spectra of PBDB-T:ITCC-M and J52-2F:IT-M OSCs; (c) J-V curves and (d) EQE spectra of PBDTTT-E-T:IEICO and PTB7-Th:IEICO-4F OSCs

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Figure 4. (a) Device architecture of the tandem OSCs; (b) Schematic energy level diagram of each material in this tandem OSCs; (c) J-V curves of tandem OSCs; (d) EQE spectra of front and rear subcells and the summed EQE spectra of the subcells

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Table 1. Photovoltaic parameters of single-junction devices

Active layer	VOC (V)	JSC (mA/cm²)	FF	PCE^c (%)	Thickness (nm)
PBDB-T:ITCC-M	0.993	14.7	0.652	9.52 (9.28 ± 0.19)	100
J52-2F:IT-M	0.944	18.3	0.697	12.0 (11.7 ± 0.2)	125
	0.950	18.3	0.720	12.5 (12.2 ± 0.2)	110
	0.952	18.2	0.726	12.6 (12.3 ± 0.2)	100
	0.949	17.0	0.725	11.7 (11.3 ± 0.3)	85
PBDTTT-E-T:IEICO	0.822	18.8	0.661	10.2 (9.82 ± 0.26)	100
PTB7-Th:IEICO-4F a	0.731	24.4	0.585	10.4 (10.0 ± 0.3)	100
PTB7-Th:IEICO-4F b	0.705	24.9	0.663	11.6 (11.3 ± 0.2)	110
	0.708	24.7	0.679	11.9 (11.5 ± 0.3)	100
	0.708	23.8	0.686	11.6 (11.2 ± 0.3)	80
a Chlorobenzene is used as a solvent and the device was fabricated according to reported methods; b Chloroform is used as a solvent; c The average PCE was calculated from more than 10 devices. The devices based on PBDB-T:ITCC-M and PBDTTT-E-T:IEICO were farbricated according to the optimal conditions in a previous work than 10 independent cells.

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Table 2. Photovoltaic parameters of tandem devices with different thicknesses of the subcells

Thickness (nm)		V_OC (V)	J_SC (mA/cm²)	FF	PCE^a (%)
Front cell	Rear cell	V_OC (V)	J_SC (mA/cm²)	FF	PCE^a (%)
130	120	1.79	11.5	0.648	13.4 (12.9 ± 0.3)
120	100	1.64	12.9	0.675	14.3 (13.8 ± 0.3)
110	100	1.65	13.3	0.680	14.9 (14.5 ± 0.2)
100	100	1.65	12.8	0.674	14.2 (13.9 ± 0.2)
110	110	1.65	13.2	0.679	14.8 (14.5 ± 0.2)
110	80	1.65	12.1	0.677	13.4 (13.0 ± 0.3)
^a The average PCE was calculated from more than 10 devices.