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Voltage Doubler Circuit01:23

Voltage Doubler Circuit

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A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Efficient and Stable Perovskite Solar Cell with High Open-Circuit Voltage by Dimensional Interface Modification.

Wei Luo1, Cuncun Wu1, Duo Wang1

  • 1State Key Laboratory for Mesoscopic Physics and Department of Physics , Peking University , Beijing 100871 , P. R. China.

ACS Applied Materials & Interfaces
|February 5, 2019
PubMed
Summary

Researchers improved perovskite solar cell stability and efficiency using 1,8-octanediammonium iodide (ODAI). This interface modification protected the perovskite, maintaining 92% of initial efficiency after 120 days in ambient conditions.

Keywords:
ambient stabilitydefect passivationdimensional interface engineeringenergy level modificationhigh open-circuit voltageperovskite solar cell

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Organic-inorganic hybrid perovskite solar cells offer high efficiency but suffer from environmental instability, particularly moisture sensitivity.
  • This instability hinders their commercial application and long-term performance.

Purpose of the Study:

  • To enhance the stability and performance of perovskite solar cells through interface modification.
  • To investigate the protective effects of 1,8-octanediammonium iodide (ODAI) on formamidinium lead iodide (FAPbI3) perovskite surfaces.

Main Methods:

  • In situ construction of a two-dimensional modified interface using ODAI and residual PbI2 on FAPbI3 perovskite surfaces.
  • Investigating the structural arrangement of ODA2+ ions on the perovskite surface.
  • Evaluating the stability and power conversion efficiency (PCE) of unencapsulated devices under ambient conditions.

Main Results:

  • The ODAI modification effectively passivated defects and modified interface energy levels, leading to improved device performance.
  • Unencapsulated perovskite solar cells retained 92% of their initial efficiency after 120 days of ambient storage.
  • A higher open-circuit voltage (1.13 V vs. 1.04 V) and a champion PCE of 21.18% were achieved, with a stabilized output of 20.64%.

Conclusions:

  • 1,8-octanediammonium iodide is an effective material for enhancing the stability and performance of perovskite solar cells.
  • Interface engineering with ODAI offers a promising strategy to overcome the environmental instability challenges of perovskite photovoltaics.
  • The horizontal orientation of ODA2+ ions contributes to effective protection of the bulk perovskite structure.