Photonic upconversion of in-band light into shorter-wave-length light has been proposed as a protocol to overcome the Shockley-Queisser (SQ) limit of photovoltaics. Many research contributions haveattempted the incorporation of upconversion materials to realize thisstrategy. However, devising a real device with an efficiency exceeding theSQ limit still remains technically unreachable. To understand thisparadoxical question, herein we use a typical upconversion nanoparticle(UCNP) with halide perovskite as a platform to quantify the UCcontribution to the efficiency improvement. Our results show that theUC-induced photocurrent gain is negligible; nevertheless, the incorpo-ration of nanomaterials even without UC capability can still enhance thephotocurrent, which is related to a redistribution of the opticalfield andconsequently a homogenization of the opticalfield (HOF). This can lead toa reduced photocarrier loss and provide a noticeable photocurrent enhancement (ca. 7%), which explains the generalphotocurrent improvement in solar cells with nanomaterials.
Hou, Y., Zhang, J., Zheng, X., Lu, Y., Pogrebnyakov, A., Wu, H., et al. (2022). Homogenization of Optical Field in Nanocrystal-Embedded Perovskite Composites. ACS ENERGY LETTERS, 7(5), 1657-1671 [10.1021/acsenergylett.2c00608].
Homogenization of Optical Field in Nanocrystal-Embedded Perovskite Composites
Brown T. M.;
2022-01-01
Abstract
Photonic upconversion of in-band light into shorter-wave-length light has been proposed as a protocol to overcome the Shockley-Queisser (SQ) limit of photovoltaics. Many research contributions haveattempted the incorporation of upconversion materials to realize thisstrategy. However, devising a real device with an efficiency exceeding theSQ limit still remains technically unreachable. To understand thisparadoxical question, herein we use a typical upconversion nanoparticle(UCNP) with halide perovskite as a platform to quantify the UCcontribution to the efficiency improvement. Our results show that theUC-induced photocurrent gain is negligible; nevertheless, the incorpo-ration of nanomaterials even without UC capability can still enhance thephotocurrent, which is related to a redistribution of the opticalfield andconsequently a homogenization of the opticalfield (HOF). This can lead toa reduced photocarrier loss and provide a noticeable photocurrent enhancement (ca. 7%), which explains the generalphotocurrent improvement in solar cells with nanomaterials.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
