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研制具有较大活性面积的钙钛矿太阳电池对领域面向产业化的发展具有重要意义. 当前, 大面积钙钛矿太阳电池的性能与小面积钙钛矿太阳电池之间仍存在较大差距. 本文提出一种在透明导电薄膜衬底上预先原子层沉积TiO2薄层的策略, 有效避免了衬底局部突起与钙钛矿吸光层直接接触导致的漏电现象, 提升了小面积器件制备工艺的重复一致性. 改善的电子输运和光管理过程也提高了小面积器件的效率. 更重要的是, 本文基于原子层沉积的TiO2开展了0.5 cm2大面积钙钛矿太阳电池的研究, 通过优化TiO2层的厚度, 研制出光电转换效率高达24.8%的冠军器件(第三方认证效率24.65%), 器件的制备工艺也表现出较好的重复性. 此外, 原子层沉积了TiO2缓冲层的电池器件在氮气氛围下存储1500 h后仍然能够保留初始性能的95%以上. 总之, 在粗糙衬底上预先原子层沉积TiO2薄层可以有效抑制局部漏电通道的产生, 有利于制备高性能的大面积钙钛矿太阳电池.Perovskite solar cells have been widely recognized as the most promising new-type photovoltaic device due to its power conversion efficiency rapidly increasing from 3.8% to over 26% in merely fifteen years. However, the high performances are achieved mainly on small area cells with an active area lower than 0.1 cm2. When enlarging the active area of perovskite solar cells, the efficiency falls dramatically. So, how to reduce the gap between performances of small area cells and large area cells gradually becomes a critical point in the path towards the commercialization of perovskite photovoltaic technology. Herein, a strategy of pre-growing thin layer of TiO2 on a rough FTO substrate by atomic layer deposition method before spin-coating SnO2 nanoparticles is proposed. Due to the inherent conformal film growth mode of atomic layer deposition, the FTO substrate can be completely covered by TiO2, thus preventing the direct contact between local protrusions of FTO and perovskite layer and impeding the current leakage phenomenon, which can be verified by the measurements from X-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy, and further proved by the dark current measurement. By using this method , the repeatability and consistency of the small area cell fabrication technology on the same substrate are improved obviously. The improved electron transport process revealed by photoluminescence results and incident light management process revealed by external quantum efficiency results also brings about better solar cell performances. More importantly, highly efficient 0.5 cm2 large area perovskite solar cells are fabricated through optimization of TiO2 thickness. When growing 200 cycles TiO2 (~9 nm in thickness) by using atomic layer deposition technology, the champion large area perovskite solar cell possesses a power conversion efficiency as high as 24.8% (certified 24.65%). The device performances also show excellent repeatability between different fabrication batches. The perovskite solar cell with TiO2 buffer layer deposited on the atomic layer can still retain over 95% of its initial efficiency after having been stored in a nitrogen atmosphere for 1500 h. The technique proposed in this paper can be helpful in manufacturing perovskite solar cell modules in the realistic photovoltaic market and can be extended to the large area fabrication of other perovskite optoelectronic devices such as light emitting diode, laser and detector.
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Keywords:
- atomic layer deposition /
- metal oxide /
- large area /
- perovskite solar cell
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图 1 FTO衬底上有无ALD生长TiO2样品的XPS结果, 其中(a) 扫描全谱, (b) Ti的2p轨道, (c) Sn的3d轨道; 样品表面SEM结果, 其中 (d) FTO衬底, (e) FTO/TiO2, (f) FTO/TiO2/SnO2
Fig. 1. XPS results of FTO substrate with and without ALD grown TiO2: (a) Full spectrum; (b) Ti 2p orbit; (c) Sn 3d orbit. Surface SEM results: (d) FTO substrate; (e) FTO/TiO2; (f) FTO/TiO2/SnO2
图 2 三种条件样品的(a)—(c)截面SEM结果和(d)—(f)表面AFM结果 (a), (d) FTO衬底; (b), (e) FTO/TiO2; (c), (f) FTO/TiO2/SnO2
Fig. 2. (a)–(c) Cross-section SEM results and (d)–(f) surface AFM results for (a) , (d) FTO substrate; (b) , (e) FTO/TiO2; (c), (f) FTO/TiO2/SnO2
图 3 单独SnO2上和TiO2/SnO2上生长钙钛矿的光致发光测试结果 (a) 稳态荧光; (b) 时间分辨荧光
Fig. 3. Photoluminescence results for perovskite grown on SnO2 or TiO2/SnO2: (a) Steady state photoluminescence; (b) time-resolved photoluminescence.
图 4 有无TiO2层的小面积钙钛矿太阳电池测试结果 (a) 快速单次J-V扫描曲线; (b) 慢速正向和反向扫描J-V曲线; (c) 外量子效率随波长变化和积分电流密度随波长累加曲线; (d) 暗态电流-电压曲线
Fig. 4. Measurement results of small area perovskite solar cells with or without TiO2 layer: (a) Single J-V sweep curve under fast scan mode; (b) reverse and forward J-V sweep curves under slow scan mode; (c) EQE and accumulated integrated current density versus wavelength curves; (d) current-voltage curves under dark environment.
图 5 0.5 cm2大面积钙钛矿太阳电池测试结果 (a) 不同TiO2厚度电池性能对比; (b) 电池制备工艺重复性; (c) 冠军电池快速单次J-V扫描曲线(内插图为第三方认证结果); (d) 冠军电池慢速正向和反向扫描J-V曲线
Fig. 5. Measurement results for 0.5 cm2 large area perovskite solar cells: (a) Solar cell performances comparison of different TiO2 thicknesses; (b) repeatability of solar cell fabrication technology; (c) single J-V sweep curve under fast scan mode for champion cell (inset graph: certified result); (d) reverse and forward J-V sweep curves under slow scan mode for champion cell.
图 6 有无TiO2层的钙钛矿太阳电池在氮气氛围中长期放置稳定性
Fig. 6. Long term storage stability under nitrogen atmosphere of perovskite solar cells with or without TiO2 layer.
表 1 有无ALD生长的金属氧化物缓冲层制备的整块器件分割出的子电池效率
Table 1. Power conversion efficiency of the sub-cells from the whole device with or without ALD grown metal oxide buffer layer.
电子传输层 F1-PCE /% F2-PCE
/%F3-PCE
/%F4-PCE
/%旋涂SnO2 25.40 24.95 25.76 8.72 ALD SnO2/旋涂SnO2 24.27 25.74 25.16 25.29 ALD TiO2/旋涂SnO2 25.92 26.46 26.21 25.92 
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表 2 有无ALD生长的TiO2整块器件上性能最佳子电池的各项参数
Table 2. Performance parameters of the best sub-cell on the whole device with or without ALD. grown TiO2.
电子传输层 VOC/V JSC/(mA·cm–2) FF/% PCE/% Reverse PCE, forward PCE/% SnO2 1.17 26.00 84.65 25.76 25.25/24.87 TiO2/SnO2 1.18 26.30 85.19 26.46 25.99/25.81
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表 3 不同TiO2生长循环数制备的大面积钙钛矿太阳电池性能参数
Table 3. Performance parameters of large area perovskite solar cells fabricated based on TiO2 grown by different cycles.
TiO2生长循
环数/cycleVOC/V JSC/(mA·cm–2) FF/% PCE/% 0 1.17 24.44 74.36 21.33 100 1.17 25.39 76.11 22.65 200 1.18 25.45 79.86 24.07 400 1.17 25.39 61.57 18.23
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