Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.067
Publication date: 30th March 2023
Organic and metal halide perovskite solar cells have attracted increasing attention as one of the most promising photovoltaic devices. Currently, the power conversion efficiency (PCE) has exceeded 19% for organic solar cells and 25% for perovskite solar cells. In both cases, interfaces in the device would have great impact on photovoltaic performances, especially on open-circuit voltage (VOC) because charge carriers would recombine bimolecularly at the interface. In this talk, I will focus on the relationship between VOC and interface in polymer solar cells and perovskite solar cells. First, I will talk about how interfacial charge transfer (CT) states impact on VOC in polymer solar cells. More specifically, we employed two crystalline polymers (PTzBT-BOHD and PTzBT-12OD), which are based on the same backbone with different side chains (BOHD: butyloctyl and hexyldecyl, 12OD: dodecyl and octadecyl), and a fullerene derivative PCBM. Interestingly, two crystalline polymer cells exhibit different VOC even though BOHD and 12OD neat films exhibit the same ionization energy. By analyzing the interfacial CT state, we found the CT state energy is higher in BOHD/PCBM than in 12OD/PCBM blend films. This is because HOMO level of BOHD is deeper than that of 12OD in disordered mixed phase in blend films, which results from twisted backbone of BOHD [1]. Second, I will talk about how aging and passivation impact on VOC in perovskite solar cells. Interestingly, VOC is further improved after ambient storage even for the passivated device where surface recombination is effectively suppressed by the passivation layer. By analyzing electronic properties of each layer, we found that the HOMO level of spiro-OMeTAD is deepened after ambient storage, resulting in energy matching between perovskite and spiro-OMeTA layers and hence reduced surface recombination [2,3]. These findings indicate that interface engineering is crucial for further improvement in VOC of not only polymer solar cells but also perovskite solar cells.
This study was partly supported by a green innovation fund project commissioned by the New Energy and Industrial Technology Development Organization (NEDO), and by JST MIRAI projects Grant Number JPMJMI20E2 and JPMJMI22E2, Japan.
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