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Abstract Although perovskite solar cells have achieved efficiency over 25%, the toxic of Pb content remains severe problem given its commercial prospect. Especially when the devices suffer harsh weather, the Pb content can easily leak out to soil and water. Chelating resins (CRs) exhibit excellent superiority in treating waste water in industrial field, since the functional groups in CRs can adsorb divalent metal ion to soften and purify waste water. Herein, an iminodiacetic acid (IDA)‐CR is introduced as encapsulation over perovskite solar cells for the first time. The IDA‐CR exhibits high surface area and excellent adsorption capability. Qualitative and quantitative analysis of Pb leakage are studied, and the devices with encapsulation of IDA‐CR can detain over 90% of Pb compared with control devices without encapsulation after immersed in deionized water for 12 h even in acid situation or after heating. This IDA‐CR method provides a new strategy towards environmental and biological‐friendly perovskite optoelectronic devices.

Abstract With efficiency surpassing 25%, perovskite solar cells (PSCs) have received much attention because of their excellent potential in photovoltaic field. However, there are some challenging issues still exist which need to be addressed. One issue is that the surface/interface and grain boundaries related defects and traps could work as charge recombination centers during the device operation, compromising the charge transfer as well as the device performance. Another issue is the leakage of toxic Pb, which may cause undesired contamination to water or soil and make devices not appropriate to work outdoors. Herein, the dithiol molecule was introduced to passivate surface defects and traps as well as reduce the Pb leakage. The unsaturated Pb2+ usually acting as recombination centers could coordinate with thiol group to reduce the recombination. Meanwhile, the beneficial band bend was observed, which facilitates the interface charge transfer. Crucially, we confirmed dithiol molecule could help reduce the Pb leakage. Retarded dissolution of PbI2 into water was observed for perovskite films after dithiol treatment, which eventually contributed less Pb leakage. Overall, this study proposes a universal strategy for defects passivation and reduced lead leakage, which is promising for environmental stable optoelectronic applications.

Abstract Immunotherapy is a class of promising anticancer treatments that has recently gained attention due to surging numbers of FDA approvals and extensive preclinical studies demonstrating efficacy. Nevertheless, further clinical implementation has been limited by high variability in patient response to different immunotherapeutic agents. These treatments currently do not have reliable predictors of efficacy and may lead to side effects. The future development of additional immunotherapy options and the prediction of patient‐specific response to treatment require advanced screening platforms associated with accurate and rapid data interpretation. Advanced engineering approaches ranging from sequencing and gene editing, to tumor organoids engineering, bioprinted tissues, and organs‐on‐a‐chip systems facilitate the screening of cancer immunotherapies by recreating the intrinsic and extrinsic features of a tumor and its microenvironment. High‐throughput platform development and progress in artificial intelligence can also improve the efficiency and accuracy of screening methods. Here, these engineering approaches in screening cancer immunotherapies are highlighted, and a discussion of the future perspectives and challenges associated with these emerging fields to further advance the clinical use of state‐of‐the‐art cancer immunotherapies are provided.