Efficient Hybrid Tandem Solar Cells Based on Optical Reinforcement of Colloidal Quantum Dots with Organic Bulk Heterojunctions

Havid Aqoma, Imil Fadli Imran, Muhibullah Al Mubarok, Wisnu Tantyo Hadmojo, Young Rag Do*, Sung Yeon Jang

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    19 Scopus citations

    Abstract

    While colloidal quantum dot photovoltaic devices (CQDPVs) can achieve a power conversion efficiency (PCE) of ≈12%, their insufficient optical absorption in the near-infrared (NIR) regime impairs efficient utilization of the full spectrum of visible light. Here, high-efficiency, solution-processed, hybrid series, tandem photovoltaic devices are developed featuring CQDs and organic bulk heterojunction (BHJ) photoactive materials for front- and back-cells, respectively. The organic BHJ back-cell efficiently harvests the transmitted NIR photons from the CQD front-cell, which reinforces the photon-to-current conversion at 350–1000 nm wavelengths. Optimizing the short-circuit current density balance of each sub-cell and creating a near ideal series connection using an intermediate layer achieve a PCE (12.82%) that is superior to that of each single-junction device (11.17% and 11.02% for the CQD and organic BHJ device, respectively). Notably, the PCE of the hybrid tandem device is the highest among the reported CQDPVs, including single-junction devices and tandem devices. The hybrid tandem device also exhibits almost negligible degradation after air storage for 3 months. This study suggests a potential route to improve the performance of CQDPVs by proper hybridization with NIR-absorbing photoactive materials.

    Original languageEnglish (US)
    Article number1903294
    JournalAdvanced Energy Materials
    Volume10
    Issue number7
    DOIs
    StatePublished - Feb 1 2020

    Keywords

    • colloidal quantum dot
    • optical reinforcement
    • organic bulk heterojunction
    • solution process
    • tandem solar cell

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • General Materials Science

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