Tan Hairen's team from Nanjing University Nature: Series solar cells with improved grain surface passivation

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Date: 2022-02-09Read: 30

CongratulationsProfessor Tan Hairen from Nanjing UniversityIn international academic journals《Nature》The latest research results on improving grain surface passivation in fully perovskite series solar cells have been published. The Japanese SAN-EI model XH-50S1 dual lamp hyperspectral matching solar simulator represented by our company provided effective measurement results during the research process.

Research Background

All perovskite series solar cells are expected to surpass the efficiency limit of single junction solar cells; However, so far, the fully perovskite series with better performancesolar cellThe certification efficiency is lower than that of single junction perovskite solar cells. So the high photocurrent density of the series connected battery requires a relatively thick hybrid Pb Sn narrow bandgap sub cell to achieve. However, the diffusion length of charge carriers in Pb Sn perovskite is short, so the research on all perovskite series solar cells is somewhat challenging.

main content

The team led by Tan Hairen has doubled the diffusion length of charge carriers in Pb Sn perovskite through research experiments, reaching over 5 μ m; The certified efficiency of all perovskite series solar cells is 26.4%, exceeding those with better performanceSingle junction perovskite solar cells.

Measurement examples

The article mentions that all perovskite series solar cells are sensitive to spectra, and xenon lamp solar simulators perform interval integration at intervals of every 100 nm within the wavelength range of 400-900 nm; Between the wavelength range of 900-1100 nm, interval integration is performed at intervals of every 200 nm, and the spectral adaptation is within ± 25%. Compared with the AM1.5G solar spectrum in the near-infrared region, the fluctuation is too large and there is a significant mismatch. The dual lamp solar simulator integrates the wavelength range of 400-1100 nm at intervals of every 50 nm, ensuring spectral adaptation within ± 5%. It has a higher matching degree with the AM1.5G solar spectrum and is more suitable for characterizing the photoelectric characteristics of series solar cells than xenon lamp solar simulators. therefore inDual Lamp Solar Simulator (SAN-EI ELECTRIC, XH-50S1)Under illumination, the J-V and other photoelectric characteristics of series connected solar cells can be better characterized.(The specific comparison between xenon lamp solar simulator and dual lamp solar simulator is shown below)

Xenon lamp solar simulator vs dual lamp solar simulator

Xenon lamp solar simulator:

•Spectral range: 350nm~1100nm

•Spectral mismatch: ＜ ± 25%*

•When calculating spectral mismatchThe spectral integration interval：

1. Within the spectral range of 400~900nm, with 100nm as theSpectral integration interval

2. Within the spectral range of 900~1100nm, with 200nm as theSpectral integration interval

Xenon lamp solar simulator spectrum comparison chart (black is AM1.5G solar spectrum chart, red is xenon lamp solar simulator test spectrum chart)

Dual lamp solar simulator:

•Spectral range: 350nm~1800nm

•Spectral mismatch: ＜ ± 5% MS level

•Spectral integration interval for calculating spectral mismatch:

Within the spectral range of 400~1100nm, 50nm is usedSpectral integration interval

Spectral comparison chart of dual lamp solar simulator (green for AM1.5G solar spectrum chart, red for dual lamp solar simulator test spectrum chart)

Literature information:All-perovskite tandem solar cells with improved grain surface passivation

Renxing Lin, Jian Xu, Mingyang Wei, Yurui Wang, Zhengyuan Qin, Zhou Liu, Jinlong Wu, Ke Xiao, Bin Chen, So Min Park, Gang Chen, Harindi R. Atapattu, Kenneth R. Graham, Jun Xu, Jia Zhu, Ludong Li, Chunfeng Zhang, Edward H. Sargent & Hairen Tan

This news is fromliteratureAll-perovskite tandem solar cells with improved grain surface passivation， For more detailed content, please refer to the original text. Thank you）

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