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2022 Science (IF 47.728), Breakthrough Efficiency of 25%! How to make inverted perovskite solar cells highly efficient and stable?

Enlitech’s REPS system makes Voc-loss analysis of solar cells no longer out of reach!

  Compared with traditional n-i-p perovskite solar cells, inverted (p-i-n) perovskite solar cells have higher stability and lifetime, but generally have lower power conversion efficiency (PCE). Defects and non-ideal charge transport at the interface between the perovskite active layer and the charge transport layer are one of the key factors affecting the efficiency and stability of inverted perovskite solar cells. Therefore, selecting effective interfacial layer materials and further enhancing the performance and stability of inverted perovskite solar cells (PSCs) are crucial for their commercial development.

  A study published in the journal Science (IF 47.728) in April 2022. The research team used ferrocenyl-bis-thiophene-2-carboxylate (FcTc2) to provide a new idea for designing stable and efficient interface materials for perovskite solar cells. The ferrocene organometallic derivatives possess the excellent properties of both organic and inorganic materials. As a functionalized interface layer, they can effectively reduce the non-radiative recombination in the interface of inverted perovskite solar cells and accelerate the charge transfer at the same time.

  The researchers conducted experiments by using Enlitech’s ELCT-3010 system (now REPS perovskite photovoltaic VOC loss analysis system) and other instruments. The results showed that the open-circuit voltage (VOC) and fill factor (FF) of the device functionalized through the FcTc2 interface were improved. A record efficiency of 25% for inverted perovskite solar cells was reached (certified efficiency of 24.3%). In addition, it still maintained 98% of the initial efficiency after 1500 hours of long-term simulated AM1.5 illumination; the stability test in hot and humid environment (85°C/85% RH) passed the international standard of IEC 61215:2016.

  Enlitech’s REPS Perovskite Photovoltaic Voc-loss Analysis System can measure Electroluminescence (EL) quantum efficiency (EQEEL) and very low EL-EQE signals be detected (as low as 10-5%, or 7 orders of magnitude). Furthermore, the analyzing software, SQ-VLA, can help users match the calculated Voc-loss with the real Voc-loss of the IV curve, thereby promoting the research progress and journal publication.

Inverted perovskite solar cell electroluminescence efficiency EL-EQE

Performance characterization of the component.

  1. FcTc2-functionalized inverted perovskite solar cells reached a record efficiency of 25% (certified efficiency 24.3%). VOC: 1.184V (1.179V); JSC: 25.68 mA cm-2 (25.59 mA cm-2); FF: 82.32% (80.56%).
  2. The electroluminescence efficiency of FcTc2-functionalized perovskite solar cell reached 7%. The energy loss due to non-radiative recombination was calculated to be as low as 68.75 mV, which was much smaller than the 108.57 mV of the control device. It was further proved that FcTc2 could effectively inhibit the non-radiative recombination of perovskite solar cells and reduce the energy loss.
Device efficiency characterization dual-functional

Stability test of perovskite components.

  1. The encapsulated FcTc2 perovskite component maintained 98% of the original efficiency after 1500 hours of continuous AM1.5 illumination.
  2. According to the IEC 61215:2016 international standard for more stringent stability tests, the FcTc2 perovskite component can maintain 95% of the original efficiency after 1000 hours at 85°C/85% RH.

Keywords: p-i-n Perovskite, inverted perovskite solar cells, Voc-loss analysis, EQEEL, Quantum Efficiency

Article link: https://www.science.org/doi/10.1126/science.abm8566

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