全球钙钛矿与叠层电池产业化论坛：碘末端自组装单层界面可提高钙钛矿太阳能电池寿命近6倍

全球钙钛矿与叠层电池产业化论坛：碘末端自组装单层界面可提高钙钛矿太阳能电池寿命近6倍Fig. 4 Characterization of operational stability–tested PSCs.Normalized PCE of PSCs without SAMs and ones with H-SAM or I-SAM (three devices) as a function of time under the following conditions: 1-sun continuous illumination MPP tracking unencapsulated flowing N2 atmosphere and room temperature. PCE was recorded about every hour. The lines are linear fits to the data after initial burn-in and

今日，来自布朗大学的课题组在《Science》发布了钙钛矿太阳能电池的最新成果。

通过使用碘末端自组装单分子层(I-SAM)于钙钛矿太阳能电池(PSC)中，使电子传输层(ETL)与卤化物钙钛矿薄膜之间的界面处的粘合韧性提高50％，从而提高机械强度可靠性。使用I-SAM的处理还将能量转换效率从20.2％提高到21.4％，减少了磁滞现象，并提高了运行稳定性，预计T80(保留的初始效率将达到80％的初始效率)在1个光照条件下会从约700小时增加到4000小时照明和连续最大功率点。在稳定性测试中，不含SAM的PSC在ETL /钙钛矿界面处出现了不可逆的广泛形变，包括空隙形成和分层，而带有I-SAM的PSC的损伤累积最小。该结果差异归因于界面处羟基减少和较高的界面韧性的组合。以下为实验部分过程。

Fig. 1 Mechanical behavior of the ETL/MHP interface.

(A) Schematic illustration of the sandwich DCB specimen for toughness testing (not to scale). PMMA poly(methyl methacrylate). Inset shows magnified schematic illustration of idealized I-SAM. (B) Toughness of ETL/MHP interface without SAMs and ones with H-SAM or I-SAM. The histograms and error bars represent average and standard deviation respectively of 12 specimens each (see table S1 for the data). (C and D) Charge transfer density difference plots from DFT calculations. Bonding between PbI2-terminated α-FAPbI3 (001) surface and (C) H(CH2)3H (“H-SAM”) or (D) H(CH2)3I (“I-SAM”). The yellow and blue colors indicate electron gain or loss above 0.0047 e·Å−3 respectively. Dashed lines across the interface indicate no bonding.

Fig. 2 Structure and performance of PSCs.

(A) Schematic illustration (not to scale) of the n-i-p regular planar PSCs with SAMs (SAMs absent in control PSC). HTL hole transport layer. Cross-sectional SEM images of as-fabricated PSCs: (B) without SAMs (C) with H-SAM and (D) with I-SAM. Scale bars 1 μm. (E) J-V responses in reverse (R) and forward (F) scans of champion PSCs without SAMs and ones with H-SAM or I-SAM. (See Table 1 for PV performance parameters.) (F) EQE spectra and integrated JSC of the champion PSCs without SAMs and ones with H-SAM or I-SAM.

Fig. 3 Operational stability of PSCs.

Normalized PCE of PSCs without SAMs and ones with H-SAM or I-SAM (three devices) as a function of time under the following conditions: 1-sun continuous illumination MPP tracking unencapsulated flowing N2 atmosphere and room temperature. PCE was recorded about every hour. The lines are linear fits to the data after initial burn-in and nonmonotonic behavior where the y intercept and the slope are used to estimate and project the T80 duration.

Fig. 4 Characterization of operational stability–tested PSCs.

(A to C) Cross-sectional SEM images of the PSC without SAMs tested for 757 hours showing morphological degradation at the ETL/MHP interface: (A) small voids (dashed circles/ovals) (B) large voids (dashed oval) and (C) delamination (arrow). (D) Cross-sectional SEM image of the PSC with H-SAM tested for 754 hours showing delamination (arrows). (E) Cross-sectional SEM image of a PSC with I-SAM tested for 1331 hours with intact ETL/MHP interface. (F and G) SEM images of fracture surface (perovskite bottom side) of the PSC without SAMs showing: (F) small and large voids (dashed circles/ovals) and (G) interfacial delamination (arrows). (H) Corresponding SEM image of the PSC with H-SAM showing voids (dashed circles/ovals) and delamination (arrows). (I) Corresponding SEM image of the PSC with I-SAM showing minimal morphological degradation (dashed circles/ovals). Scale bars 0.5 μm [(A) to (E)] and 1 μm [(F) to (I)].

论文DOI：10.1126/science.abf5602

截止目前，2021年钙钛矿领域共有5篇Science，分别为

No.1：该来的还是来了: 2021年钙钛矿首篇Science-纳米棒显著提高钙钛矿太阳能电池性能；

No.2：2021年第二篇钙钛矿 UCLA杨阳教授团队：有机共轭阳离子重构能带边缘，提高效率和稳定性等；

No.3：可喜可贺！两篇最新Science-手性诱导钙钛矿纳米晶室温自旋LED和魔角石墨烯共一均含中国学者

No.4：黄维院士最新Science：高湿度及室温环境下制备高效稳定黑相甲脒基碘化铅钙钛矿

No.5: 本篇

截止目前，今年发表在《Science》的钙钛矿文章一作均有中国学者，很可怕，估计最后还是会和去年一样，一作基本均为中国学者(太吓人，2020年钙钛矿领域发表在Science/Nature上的文章一作基本都是中国籍学者)，没办法，谁叫咱们干活猛呢！如果这批人都在国内教职，那卷起来的程度还是很可怕的，现在已经有部分高校开始不招钙钛矿方向的青椒，钙钛矿最终能走多久，让我们拭目以待吧。

2021年钙钛矿领域目前共有Nature3篇

No.1: Nature! 美国MIT&韩国KRICT: 能量转换效率25.2%的钙钛矿太阳能电池-通过调控二氧化锡

No.2: 又来了! 牛津大学Nature: 多齿配体作用下的高效稳定红光混合卤化物钙钛矿LED

No.3 最新Nature: 两篇背靠背魔角石墨烯(曹原等)及一篇钙钛矿太阳能电池

对于钙钛矿这个方向的研究，我们已经发过相关推文，部分如下：

1：钙钛矿这个材料还能发多少篇Nature/Science?

2：短评：钙钛矿和TADF材料竟然有这么多共同点

3：美国能源部计划拨款2千万美元，致力于解决钙钛矿太阳能电池稳定性及产业化问题

4：年末汇总：15家致力于推动钙钛矿太阳能光伏电池产业化发展的中国(国内)公司

5：欧洲最新钙钛矿光电子项目 近3000万人民币 14个全奖职位