4.7 Article

PCDTBT8-Doped PffBT4T-2OD-Based Ternary Solar Cells with Enhanced Open-Circuit Voltage, Fill Factor, and Charge Separation Efficiency

Journal

SOLAR RRL
Volume 5, Issue 11, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100670

Keywords

charge separation and recombination; donor; acceptor interfaces; open-circuit voltage; power conversion efficiency; ternary polymer solar cells; voltage loss

Funding

  1. National Natural Science Foundation of China [12074059]

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The study investigates the effect of doping a medium bandgap polymer into traditional binary heterojunction solar cells for ternary solar cells. Simulation and global modeling reveal the competition mechanism of electron transfer and evaluate crucial parameters, showing that doping different bandgap polymers can enhance electron transfer and improve key performance indicators of ternary solar cells.
The effect of a medium bandgap polymer doped into conventional binary heterojunction solar cells is investigated for ternary solar cells, which display different characteristics compared with traditional materials. First, the charge separation and recombination at the multi-interface (double donors/single acceptor) and the charge transport between different phases are simulated to reveal the competition mechanism of electron transfer and insights into the merits and demerits of a hole transport layer with medium and narrow band gaps. Second, global modeling of performance for PCDTBT8-doped PffBT4T-2OD-based ternary solar cells is established to evaluate the crucial parameters (open-circuit voltage (V-OC), short-circuit current (J(SC)), fill factor (FF), and power conversion efficiency (PCE)) related to the experiment. The results demonstrate that the orbital energy levels, absorption peak, excited-state, fluorescence lifetimes, and hole transportability are tunable upon the medium bandgap polymer doping process. The electron transfer process for the multi-interface is enhanced by doping different bandgap polymers compared with a single interface, which contributes to the energy match and multistep jump mechanism. Ternary solar cells based on the doped polymer exhibit better V-OC, FF, and PCE with weakened J(SC). The theoretical calculations are in excellent agreement with experimental results. The global investigation of ternary solar cells can be used to interpret experiments and is viewed as an effective method for screening high-performance solar cells.

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