Self-Stimulated Dissociation in Non-Fullerene Organic Bulk-Heterojunction Solar Cells

Zhu, Xixiang; Zhang, Guichuan; Zhang, Jia; Yip, Hin‐Lap; Hu, Bin

doi:10.1016/j.joule.2020.09.005

Cited by 39 publications

(50 citation statements)

References 66 publications

(80 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, we show that for PM6:BTP-eC9 (see ESI † for molecular definitions), the charge generation efficiency can be as high as 99.3%. In addition to the energetics, which have been the subject of several recent and important studies, [17][18][19][20][21][22] we also show the central role of kinetics in charge generation. Our results reveal that charge generation in this system involves an energetic barrier which is several times larger than the thermal energy at room temperature (in accordance with previous reports on similar systems 28 ) yet is extremely efficient due to the faster dissociation rate of bound states to free charges compared with their decay rate.…”

Section: Introductionsupporting

confidence: 53%

“…[14][15][16] These new findings are extremely promising for OSCs technologically and have also encouraged further fundamental work on the dynamics of charge generation. [17][18][19] This new insight into NFA-based OSCs [20][21][22] has raised important, and potentially field redefining questions such as: what is the maximum charge generation yield that can be realized in organic semiconductor photovoltaics; is a driving force for efficient charge generation always required; and what role do charge generation kinetics play in determining the charge carrier recombination and device performance?…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Organic solar cells with near-unity charge generation yield

Zeiske

Sandberg

et al. 2021

Energy Environ. Sci.

View full text Add to dashboard Cite

show abstract

Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Organic solar cells with near-unity charge generation yield

Zeiske

Sandberg

et al. 2021

Energy Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Here, I (B) and I (0) represent the photocurrent measured with and without a magnetic field, respectively [ 32 , 33 ]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Approaching 18% efficiency of ternary organic photovoltaics with wide bandgap polymer donor and well compatible Y6 : Y6-1O as acceptor

Zeng

Gao

et al. 2020

National Science Review

227

111

View full text Add to dashboard Cite

A series of ternary OPVs are fabricated with one wide bandgap polymer D18-Cl as donor, well compatible Y6 and Y6-1O as acceptor. The open-circuit-voltage (VOC) of ternary OPVs is monotonously increased along with the incorporation of Y6-1O, indicates that the alloy state should be formed between Y6 and Y6-1O due to their excellent compatibility. The energy loss can be minimized by incorporating Y6-1O, leading to the VOC improvement of ternary OPVs. By finely adjusting the Y6-1O content, the PCE of 17.91% is achieved in the optimal ternary OPVs with 30 wt% Y6-1O in acceptors, resulting from synchronously improved short-circuit-current density (JSC) of 25.87 mA cm−2, fill factor (FF) of 76.92%, and VOC of 0.900 V in comparison with those of D18-Cl:Y6 binary OPVs. The JSC and FF improvement of ternary OPVs should be ascribed to comprehensively optimal photon harvesting, exciton dissociation and charge transport in ternary active layers. The more efficient charge separation and transport process in ternary active layers can be confirmed from the magneto-photocurrent and impedance spectroscopy experimental results, respectively. This work provides new sight on constructing highly efficient ternary OPVs with well compatible Y6 and its derivative as acceptor.

show abstract

“…[111][112][113] These new findings are extremely promising for OSCs technologically and have also encouraged further fundamental work on the dynamics of charge generation. [114][115][116] This new insight into NFA-based OSCs [33,117,118] has raised important, and potentially field re-defining questions such as: what is the maximum charge generation yield that can be realized in organic semiconductor photovoltaics; is a driving force for efficient charge generation always required; and what role do charge generation kinetics play in determining the charge carrier recombination and device performance?…”

Section: Charge Generation In Non-fullerene Acceptor-based Organic So...mentioning

confidence: 99%

“…In particular, it is shown that for PM6:BTP-eC9, the charge generation efficiency can be as high as 0.993. In addition to the energetics, which have been the subject of several recent and important studies [33,[114][115][116][117][118],…”

Section: Organic Solar Cells With Near-unity Charge Generation Yieldmentioning

confidence: 99%

Probing the charge generation and recombination in thin-film, optoelectronic devices

Zeiske¹

View full text Add to dashboard Cite

Sustainably and environment-friendly manufactured semiconductors are at-tractive candidates for next generation electronic and optoelectronic appli-cations ranging from memory storage and computation, to power manage-ment and energy generation. In this regard, organic semiconductors, i.e., semiconductors based on conjugated carbon-based molecules and polymers derived from earth abundant elements, are the subject of intense basic re-search and technological development efforts. Understanding the funda-mental processes governing these low-mobility and disordered semiconduct-ing materials is therefore key to establish next generation applications based upon flexible and solution-processible organic semiconductors as global com-mercial technologies.The work presented in this thesis focuses on the investigation of charge generation and recombination processes on thin film optoelectronic devices based upon organic semiconductors. A suite of experimental techniques, im-proved measurement setups, and expanded approaches are presented, and form the basis of comprehensive studies on state-of-the-art, high-eﬀiciency organic photovoltaic systems. Specifically, an external quantum eﬀiciency measurement technique with unprecedented dynamic range will be detailed. Using this enhanced apparatus, an approach allowing one to accurately de-termine charge generation quantum yields is introduced. After this, an extended technique to probe photogenerated charge carrier densities is out-lined and applied to thin-film solar cells. Having emphasized the importance of studying charge generation, a combined theoretical and experimental ex-ploration of the light intensity dependence of photocurrent and charge col-lection eﬀiciency under the influence of various loss mechanisms is described. These insights provide the basis of a comprehensive study on organic so-lar cells, where recombination caused by localized trap states is found to be universally present under operational conditions limiting photocurrent and power-conversion eﬀiciency. Overall, the work presented in this thesis expands on existing techniques and approaches, and yields important new understanding as to the device physics of thin-film, optoelectronic applica-tions.

show abstract

Self-Stimulated Dissociation in Non-Fullerene Organic Bulk-Heterojunction Solar Cells

Cited by 39 publications

References 66 publications

Organic solar cells with near-unity charge generation yield

Organic solar cells with near-unity charge generation yield

Approaching 18% efficiency of ternary organic photovoltaics with wide bandgap polymer donor and well compatible Y6 : Y6-1O as acceptor

Probing the charge generation and recombination in thin-film, optoelectronic devices

Contact Info

Product

Resources

About