Organic solar cells have received widespread attention with the development of indoor light harvesters. Due to the narrow emission spectra and weak light intensity of indoor emissions, the short-circuit current of indoor devices is largely restricted, and there would be an additional voltage loss around 0.15 V from the light intensity difference. However, most state-of-the-art cells cannot be adopted as indoor photovoltaics directly, because their small optical bandgaps lead to open-circuit voltage (V_OC) values in the range of ~0.6 V in dim-lighting, which is difficult to drive most of internet of things. Herein, we revaluate the photovoltaic performance under indoor illuminances by combining a wide-gap polymer PBDB-T with various electron-accepting materials. The PBDB-T: BTA3 cell achieves an excellent efficiency higher than 25% under a 1000 lux 2700K LED illumination. The V_OC value of such a device can still maintain close to 1 V under indoor cases. We then compare the underlying mechanism of the PBDB-T-based bulk heterojunctions (BHJs) with multiple techniques, and the results indicate the unchanged advantage of high V_OC helps the BTA3-based cell shows the best indoor device performance when the light source is switched from AM1.5G to low illumination. This work revaluates the selection of state-of-the-art indoor light harvesters, and demonstrate an excellent optimal efficiency of the PBDB-T:BTA3 indoor cell up to 25.6%, with a desirable V_OC of 0.99 V.

随着室内光收集器的发展，有机太阳能电池受到了广泛关注。由于室内发射的发射光谱窄，光强弱，室内设备的短路电流受到很大限制，光强差会额外增加0.15 V左右的电压损失。然而，大多数最先进的电池不能直接用作室内光伏，因为它们小的光学带隙会导致开路电压（V _OC) 在昏暗的灯光下约 0.6 V 范围内的值，这很难驱动大多数物联网。在此，我们通过将宽隙聚合物 PBDB-T 与各种电子接受材料相结合，重新评估了室内照度下的光伏性能。PBDB-T：BTA3 电池在 1000 lux 2700K LED 照明下实现了高于 25% 的出色效率。这种设备的V _OC值在室内情况下仍然可以保持接近1 V。然后，我们将基于 PBDB-T 的体异质结 (BHJ) 的潜在机制与多种技术进行比较，结果表明高V _{OC 的}优势不变当光源从 AM1.5G 切换到低照度时，有助于基于 BTA3 的电池显示最佳的室内设备性能。这项工作revaluates状态的最先进的室内光收割机的选择，并展示PBDB-T的一个极好的最佳效率：BTA3室内小区高达25.6％，而所希望的V _OC 0.99 V的